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Data Series 454

Geochemical Database for the Boulder Batholith and Its Satellitic Plutons, Southwest Montana

By Edward A. du Bray, Karen Lund, Robert I. Tilling, Paul D. Denning, and Ed DeWitt

Abstract

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Geochemical data presented in this report pertain to Cretaceous igneous intrusions of the Boulder batholith and its satellitic plutons in southwest Montana. The geographic area addressed in this compilation is approximately bounded by lats 45.6° and 46.7° N. and longs 112.75° and 111.5° W. These data were compiled in order to establish the geologic framework for world-class mineral deposits of the Butte district. Although these deposits and their host rocks have been the subject of many investigations, the petrologic characteristics of associated intrusive rocks have not been systematically compiled, synthesized, or interpreted. Abundant late Mesozoic intrusions in the study area are probably byproducts of subduction-related processes, including back-arc magmatism that prevailed along the west edge of the North American plate during this interval. The ultimate goal of this effort will be an evaluation of the time-space-compositional evolution of Mesozoic magmatism associated with the Boulder batholith and identification of genetic associations between magmatic and mineralizing processes in this region.

First posted June 24, 2009

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Suggested citation:

du Bray, E.A., Lund, Karen, Tilling, R.I., Denning, P.D., and DeWitt, Ed, 2009, Geochemical database for the Boulder batholith and its satellitic plutons, southwest Montana:  U.S. Geological Survey Digital Data Series 454, 1 CD-ROM.  [Available at URL http://pubs.usgs.gov/ds/454]

 



Contents

Introduction

Acknowledgment

The Boulder Batholith and Its Satellitic Intrusions—Constituents of the Database

Data Compilation Methods

Data Fields

sample_number

modal_lithology

lithology

ign_form

alteration

longitude and latitude

SiO2, TiO2, Al2O3, Fe2O3, FeTO3, FeO, MnO, MgO, CaO, Na2O, K2O, and P2O5

LOI, H2O+, H2O-, Tot_H2O, CO2, Cl, F, S, SO3, FeS2, and Tot_oth_sulf

total

vol_sum

Ba, Be, Cs, Rb, Sr, Y, Zr, Hf, Nb, Th, U, Ga, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Ag, Au, Co, Cr, Ni, Sc, V, Cu, Mo, Pb, Zn, Sn, W, Ta, As, Sb, and B

data_src

rad_age

uncert

intrs_name

Plag, Kspar, Qtz, Hb, Pyx, Opx, Cpx, Ol, Bi, Opq, Acc, Acces(incl opq), and Alt

References Cited

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