Geochemistry and petrogenesis of the Laramie anorthosite complex, Wyoming
LITHOS
By: J.C. Fountain, D.S. Hodge, and Hills F. Allan
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Abstract
A geochemical investigation of the Laramie anorthosite complex determined that monsonite associated with the complex are characterized by positive Eu anomalies and display a regular variation in composition with distance from the monzonite/county rock contact. Anorthositic rocks have major and trace element abundance typical of similar complexes. The internal variations in the monzonite were produced by in situ fractionation and contamination. The data indicate that anorthosite and monzonite cannot be comagmatic. It is proposed that the anorthosite and monzonite of the complex evolved from two distinct magmas, and that two stages of anatectic melting contributed to the evolution of the monzonite. An initial stage of partial melting was induced by intrusion of a gabbroic anorthosite magma into the lower crust; a second partial melting event occurred after emplacement where heat from the intrusions melted country rocks resulting in extensive contamination ofthe monzonite. ?? 1981.
Suggested Citation
Fountain, J., Hodge, D., Allan, H.F., 1981, Geochemistry and petrogenesis of the Laramie anorthosite complex, Wyoming: LITHOS, v. 14, no. 2, p. 113-132, https://doi.org/10.1016/0024-4937(81)90049-9.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Geochemistry and petrogenesis of the Laramie anorthosite complex, Wyoming |
| Series title | LITHOS |
| DOI | 10.1016/0024-4937(81)90049-9 |
| Volume | 14 |
| Issue | 2 |
| Year Published | 1981 |
| Language | English |
| Publisher | Elsevier |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | LITHOS |
| First page | 113 |
| Last page | 132 |