Identification_Information: Citation: Citation_Information: Originator: Bawiec, Walter J. Publication_Date: 2000 Title: COVERAGE WESTTERR -- Geologic Terranes of the Island of Puerto Rico, West of 66 52' 30" West Longitude at a Scale of 1:100,000 Geospatial_Data_Presentation_Form: Map Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: USGS OFR 98-38 Publication_Information: Publication_Place: Reston, Virginia Publisher: U.S. Geological Survey Online_Linkage: () Description: Abstract: The Commonwealth of Puerto Rico can be partitioned into several subtle but distinct 'packages' of rocks as a consequence of the tectonic setting and geologic history of the Caribbean region. These packages of associated map units are treated as geologic terranes having affinities based upon lithologic rock type, depositional environment, and (or) age of deposition. Terranes are used to reconstruct and understand the large-scale geologic history of Puerto Rico. Also of use to economic geologists is the knowledge that each terrane, which hosts distinct types of mineral occurrences, requires different exploration techniques. A total of 151 map units, identified on the geologic map of Puerto Rico, are combined into twelve associated terranes for the main island. The geology of the islands of Mona, Culebra, and Vieques has not been reexamined in detail (1:100,000) in this study, and the terranes for these islands have been extrapolated from the 1:240,000 scale previously published maps of Cox and Briggs (1973). Purpose: The terrane map, which was generated by grouping geologically similar rock types, depositional environments, and (or) ages, displays twelve distinct terranes. Rocks of similar age and similar lithologic character tend to occur together. However, it must be remembered that because many of the lithologies are transitional or interfingering, they may logically be placed in more than one terrane. Terrane type was determined by the depositional environment and age of the predominant rock type for that particular map unit. Some assignments are likely ambiguous. Ultramafic rocks in Puerto Rico are igneous rocks composed chiefly of mafic minerals, and amphibolite which is a metamorphic rock consisting mainly of amphibole and plagioclase, containing little or no quartz. These rocks have potential as hosts of podiform chromite deposits, and erode to form remnant sedimentary nickel laterite deposits. Basalt in Puerto Rico is dark- to medium-dark, commonly extrusive, mafic igneous rock composed chiefly of calcic plagioclase and clinopyroxene in a glassy or fine-grained groundmass. Chert is found in association with basalt in Puerto Rico. Mineral occurrences observed in basalt include vein deposits of barite. The basalt has been quarried as traprock, an industrial product. Puerto Rico's intrusive rocks have been separated into two classes; Cretaceous, and Tertiary through Cretaceous, based upon the age of intrusion. Porphyry copper deposits found in these areas are thought to be related to the younger Eocene intrusions, and the older Cretaceous rocks have associated mineral deposits such as magnetite skarns. The Tertiary and Cretaceous intrusive terrane includes known Tertiary rocks and those rocks for which age is uncertain. Although some of these rocks have not been dated, they are included in this terrane because of their stratigraphic relationship with surrounding rocks. The age of these intrusive rocks is important, because the present potentially economic metallic mineralization of Puerto Rico has been identified with the Eocene intrusive rocks. Most important are porphyry copper systems bearing copper, molybdenum, and gold. Associated with these intrusive rocks are skarn deposits within adjacent calcareous rocks, and vein deposits in fractures and faults. Concurrent with these two periods of intrusion was the synchronous deposition of related marine volcaniclastic rocks, which cover a substantial area of Puerto Rico. Rocks described as alteration on the terrane map are metavolcanic rocks or hydrothermally altered rocks for which the protolith is uncertain (R. Krushensky, oral communications; 1994). Alteration is an important indicator for locating many types of mineral deposits. However, altered rocks are widespread and represent many different levels of alteration intensity throughout Puerto Rico. Only the most intensely altered rocks are identified on the 1:20,000 geologic quadrangle maps that were used to compile the 1:200,000 geologic map. Nonvolcaniclastic terranes are composed of biogenic or clastic map units devoid of volcanic material and cover approximately 3,900 km2 or 45 percent of the surface area of Puerto Rico. An understanding of the vertical and horizontal dimensions of these terranes is important because they host intrusion-related deposits, such as skarns and vein deposits. Pliocene through Oligocene nonvolcaniclastic terranes comprise approximately 1,500 square kilometers, or 17 percent, of the surface area and consist of limestone and calcareous clastic rock. These rocks cover older rocks present during the intrusion of metalliferous Eocene igneous rocks. This terrane is an important source for industrial minerals, including limestone and sand and gravel. Quaternary nonvolcaniclastic terranes consist of surficial deposits of alluvium, beach and swamp deposits, identified landslide areas, artificial fill, and fault breccia. Quaternary rocks are a major source for industrial minerals. Supplemental_Information: The terrane map is a combination of 3 coverages (westterr, centerr, eastterr), as can be seen in the TERRANE.AML in the AML folder of the cd-rom. There is not one coverage depicting terranes for the entire island of Puerto Rico. However, there are plots of the terrane map of the island of Puerto Rico present in different formats, including PDF, EPS, and GRA. They are located in their respective folders. The terrane coverages (westterr, centerr, eastterr) were created by using the ARC DISSOLVE command on each of the respective geologic coverages. The DISSOLVE command eliminates arcs between adjoining polygons with the same attribute; in this case the same terrane type. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1999 Status: Progress: Complete Maintenance_and_Update_Frequency: None Planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -67.27222325 East_Bounding_Coordinate: -66.85250136 North_Bounding_Coordinate: 18.51812265 South_Bounding_Coordinate: 17.92806219 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Geology Terrane Place: Place_Keyword_Thesaurus: None Place_Keyword: Puerto Rico Access_Constraints: None Use_Constraints: Anyone who uses these data must cite US Geological Survey. These data are not to be used at scales showing more detail than 1:100,000. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Bawiec, Walter J. Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing address Address: 954 National Center 12201 Sunrise Valley Drive City: Reston State_or_Province: Virginia Postal_Code: 20192 Country: United States Contact_Voice_Telephone: (703)648-6148 Contact_Facsimile_Telephone: (703)648-6383 Contact_Electronic_Mail_Address: wbawiec@usgs.gov Data_Set_Credit: The terrane map was created by transducing 151 map units, as described by Richard D. Krushensky, into 12 geologic terranes, deemed useful in understanding the mineral resources of Puerto Rico. Native_Data_Set_Environment: Windows_NT, 4.0, Intel ARC/INFO version 7.1.1 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: The terrane map, which was generated by grouping geologically similar rock types, depositional environments, and (or) ages, displays twelve distinct terranes. Rocks of similar age and similar lithologic character tend to occur together. However, it must be remembered that because many of the lithologies are transitional or interfingering, they may logically be placed in more than one terrane. Terrane type was determined by the depositional environment and age of the predominant rock type for that particular map unit. Some assignments are likely ambiguous. Logical_Consistency_Report: Polygon and chain-node topology present. All polygons have a label, and all polygons are closed. Completeness_Report: There are TWELVE GEOLOGIC TERRANES OF PUERTO RICO, which are listed below: NONVOLCANICLASTIC TERRANES Quaternary: Pliocene through Oligocene: Eocene through Cretaceous: INTRUSIVE TERRANES Tertiary through Cretaceous: Cretaceous: VOLCANICLASTIC TERRANES SUBAERIAL: MARINE: Tertiary Tertiary and Cretaceous: Cretaceous: ALTERATION TERRANE SUBMARINE BASALT AND CHERT TERRANE ULTRAMAFIC ROCK AND AMPHIBOLITE TERRANE Map Units Contained in Each Geologic Terrane [Stratigraphic units listed alphabetically within terrane] NONVOLCANICLASTIC TERRANES Quaternary: Qa Alluvium Qb Beach deposits QTs Blanket sand deposits Ql Landslide deposits Qs Swamp deposits af Artificial fill Pliocene through Oligocene: Tcbga Almirante Sur Sand Lentil of Cibao Formation Ta Aguada Limestone Tay Aymamon Limestone Tcm Camuy Formation Tcb Cibao Formation Tcbg Guajataca Member of Cibao Formation Tgua Guanajibo Formation Tjd Juana Diaz Formation Tla Lares Limestone Tcbmi Miranda Sand Member of Cibao Formation Tcbm Montebello Limestone Member of Cibao Formation Tmu Mucarabones Sand Tpo Ponce Limestone Tcbq Quebrada Arenas Limstone Member of Cibao Formation Tcbr Rio Indio Limstone Member of Cibao Fomation Ts San Sebastian Formation Tfb Fault breccia Eocene through Cretaceous: Tco Corozal Limestone Kcot Cotui Limestone Tc Cuevas Limstone Tg Guayo Formation Klm La Muda Formation Kp Parguera Limestone Kpe Penones Limestone INTRUSIVE TERRANES Tertiary through Cretaceous: TKas Alkali syenite TKap Augite andesite porphyry TKahp Augite-hornblende porphyry TKat Augite trachybasalt Td Porphyritic dacite TKda Amygdaloidal dacite TKg Diabasic gabbro Tga Gabbro TKgm Granodiorite quartz monzonite TKhda Hornblende dacite TKh Porphyry Hornblende quartz-diorite Thp Hornblende quartz diorite porphyry TKdi Diorite TKqd Quartz diorite-granodiorite TKk Quartz keratophyre Trhp Rhyodacite porphyry Cretaceous: Kdi Diorite Kdh Diorite-hornblende gabbro Kcag Granodiorite of the Caguas pluton Kmc Granodiorite of Morovis and Ciales stocks Kpgq Quartz diorite - plutonic complex of Punta Guayanes Kpsg Granodiorite of the plutonic complex of Punta Guayanes and the granodiorite of San Lorenzo batholith, undivided Ksl Granodiorite-quartz diorite of San Lorenzo batholith Ku Granodiorite-quartz diorite of the Utuado batholith Kib Intrusive breccia of the Daguao Formation Kslg Mixed granodiorite-diorite of the San Lorenzo batholith Kpgg Granodiorite of plutonic complex of Punta Guayanes Kpsq Quartz diorite of plutonic complex of Punta Guayanes and of the Granodiorite of San Lorenzo batholith Kslq Quartz diorite facies of Granodiorite of San Lorenzo batholith and diorite-hornblende gabbro Kpgqm Quartz monzonite of plutonic complex of Punta Guayanes Kpob Two pyroxene olivine basalt VOLCANICLASTIC TERRANES SUBAERIAL: Kcb Cambalache Formation Kpo Pozas Formation MARINE: Tertiary Tca Carreras Siltstone Tj Jicara Formation Tjo Jobos Formation Tl Los Puertos Formation Tm Monserrate Formation Tor Ortiz Formation Tpa Palmarejo Formation Tra Raspaldo Formation Tr Rio Culebrinas Formation Trd Rio Descalabrado Formation Trp Rio Piedras Siltstone Ty Yunes Formation Tertiary and Cretaceous: TKa Anon Formation TKamo Anon-Monserrate Formations, undivided TKay Anon and Yauco Formations, undivided TKam Anon and Maricao Formations, undivided TKci Cibuco Formation TKgu Guaracanal Formation TKl Lago Garzas Formation TKaym Anon, Yauco, and Maricao Formations, undivided TKlam Lago Garzas, Anon, and Maricao Formations, undivided TKly Lago Garzas and Yauco Formations, undivided TKal Anon Formations and Lago Garzas, undivided TKm Maricao Formation TKmy Maricao and Yauco Formations, undivided TKmly Maricao, Lago Garzas, and Yauco Formations, undivided TKn Naranjito Formation TKy Yauco Formation Cretaceous: Kac Achiote Conglomerate Kal Alonso Formation Kba Barrazas Formation Kcam Camarones Sandstone Kcn Canovanas Formation Kca Cariblanco Formation Kcan Cancel Breccia Kcar Carraizo Breccia Kcoa Coamo Formation Keo El Ocho Formation Kfa Fajardo Formation Kfr Frailes Formation Kg Guaynabo Formation Kh Hato Puerco Formation Kja Jayuya Tuff Kln Los Negros Formation Kma Magueyes Formation Kmal Malo Breccia Kman Manicaboa Formation Kmar Maravillas Formation Kmag Martin Gonzalez Lava Km Melones Limestone Kmo Monacillo Formation Kpa Pajaros Tuff Kpi Pitahaya Formation Kra Rio Abajo Formation Krp Rio de la Plata Sandstone Kr Robles Formation Ks Sabana Grande Formation Kta Tabonuco Formation Kte Tetuan Formation Kt Torrecilla Breccia Kto Tortuga Andesite Kv Vista Alegre Formation ALTERATION TERRANE TKmv Metavolcanic rock TKha Hydrothermally altered rock SUBMARINE BASALT AND CHERT TERRANE Kabcj Formations A, B, C, & J Kav Avispa Formation Kap Avispa and Perchas Formations, undivided Kbo Bqueron Basalt KJc Cajul Basalt Kce Celada Formation Kcg Cerro Gordo Lava Kco Concepcion Formation Kctt Cotorra Tuff Kd Daguao Formation Ke El Rayo Formation Kf Figuera Lava Kfd Figuera and Daguao Formations, undivided Ki Infierno Formation Kl Lajas Formation Klo Lomas Formation Kmam Mameyes Formation KJm Mariquita Chert Kper Perchas Formation Kso Santa Olaya Lava ULTRAMAFIC ROCK AND AMPHIBOLITE TERRANE KJa Amphibolite KJas Amphibolite-Serpentinite KJs Serpentinite KJb Spillitized Basalt Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The Westterr coverage is a derivitive coverage of West coverage which has a Root Mean Square (RMS) error of 24.925 meters, which means locations shown on the digital coverages are within 24.925 meters of their location on the ground. This error was computed during the transformation of coordinates from scanning units (inches) to polyconic meters. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Richard D. Krushensky Publication_Date: 1999 Title: COVERAGE WEST -- Geology of the Island of Puerto Rico, West of 66 52'30" West Longitude at a Scale of 1:100,000 Geospatial_Data_Presentation_Form: Map Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: USGS OFR 98-38 Publication_Information: Publication_Place: Reston, Virginia Publisher: U.S. Geological Survey Source_Scale_Denominator: 200,000 Type_of_Source_Media: Mylar Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1999 Source_Currentness_Reference: USGS OFR 98-38 Source_Contribution: Each geologic map unit is assigned to a geologic terrane. The arcs from the digital geologic map were dissolved, by terrane code, into the terrane map. This resulted in a map having much fewer polygons. Process_Step: Process_Description: Each polygon is assigned a geologic map unit mnemonic, which represents a specific geologic unit. Each map unit mnemonic is assigned to one of twelve geologic terranes, based upon its' depositional environment, lithology and/or age. The ARC command DISSOLVE is used to remove common arcs from adjoining polygons having the same terrane attribute. This results in a terrane map having fewer polygons and being much simplier than the original geologic map. Process_Date: 1999 Process_Step: Process_Description: First draft of metadata created by wbawiec using FGDCMETA.AML ver. 1.2 05/14/98 on ARC/INFO data set g:\resdgs2\adorrzapf\puerto\westterr Process_Date: 19991028 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point Point_and_Vector_Object_Count: 973 SDTS_Point_and_Vector_Object_Type: String Point_and_Vector_Object_Count: 1966 SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains Point_and_Vector_Object_Count: 973 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: Polyconic Polyconic: Latitude_of_True_Scale: 18 Longitude_of_Central_Meridian: -67 False_Easting: 0.00000 False_Northing: 0.00000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.0130273913964 Ordinate_Resolution: 0.0130273913964 Planar_Distance_Units: Meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.4 Denominator_of_Flattening_Ratio: 294.98 Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: The purpose of this coverage is to provide the arcs necessary to draw outlines around colored terranes. Terranes are colored by linking formation names (FMATN) of the EAST, CENTRAL, and WEST coverages to a lookup table called PRPROV.LUT. Look at TERRANES.AML in the AML folder to see how this coverage is used. Items listed below are found in the INFO files associated with the polygon attribute table (*.PAT) and arc attribute table (*.AAT). The first four items (AREA, PERIMETER, WESTTERR#, WESTTERR-ID) are Arc/Info generated and should never be altered. The last item, PROV, was used in the early development of this coverage, but is no longer current. The first seven items of *.AAT (FNODE#, TNODE#, LPOLY#, RPOLY#, LENGTH, WESTTERR#, WESTTERR-ID) are Arc/Info generated and should not be altered. The last item, NOPLOT, has a value of either '0' or '1'. Arcs with a value of NOPLOT = '1' are located on the east and/or west sides of coverages that adjoin another coverage. When these arcs are not plotted, the join between adjacent coverages becomes transparent when plotting more than one coverage. > >WESTTERR.PAT: > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 AREA 4 12 F 3 > 5 PERIMETER 4 12 F 3 > 9 WESTTERR# 4 5 B - > 13 WESTTERR-ID 4 5 B - > 17 PROV 4 4 F 0 > > >WESTTERR.AAT: > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 FNODE# 4 5 B - > 5 TNODE# 4 5 B - > 9 LPOLY# 4 5 B - > 13 RPOLY# 4 5 B - > 17 LENGTH 4 12 F 3 > 21 WESTTERR# 4 5 B - > 25 WESTTERR-ID 4 5 B - > 29 NOPLOT 4 4 F 0 > > Entity_and_Attribute_Detail_Citation: none Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Information Services Contact_Address: Address_Type: mailing address Address: Box 25286, Denver Federal Center City: Denver State_or_Province: Colorado Postal_Code: 80225-0286 Country: United States Contact_Voice_Telephone: 1-888-ASK-USGS Contact_Electronic_Mail_Address: http://mapping.usgs.gov/esic/esic.html Distribution_Liability: This Compact Disc-Read Only Memory (CD-ROM) publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Although all data and software published on this CD-ROM have been used by the USGS, no warranty, expressed or implied, is made by the U.S. Geological Survey as to the accuracy of the data and related materials and/or the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data, software, or related materials. Graphical map depictions on this disc are intended to be used within the map scale limits applicable to the source data. Although software enables the user to show images on the disc at various scales, the user is cautioned to refer to the source documentation for the appropriate map scale limitations. Metadata_Reference_Information: Metadata_Date: 19991028 Metadata_Future_Review_Date: None Planned Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Bawiec, Walter J. Contact_Position: Geologist Contact_Address: Address_Type: mailing address Address: 954 National Center 12201 Sunrise Valley Drive City: Reston State_or_Province: Virginia Postal_Code: 20192 Country: United States Contact_Voice_Telephone: (703)648-6148 Contact_Facsimile_Telephone: (703)648-6383 Contact_Electronic_Mail_Address: wbawiec@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: Version of June 8, 1994 Metadata_Access_Constraints: none Metadata_Use_Constraints: none