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Chemical and Thermal Zonation in a Mildly Alkaline Magma System Infiernito Caldera, Trans-pecos Texas.

Authors
Henry-CD; Price-JG; Smyth-RC
Source
Contrib Mineral Petrol 1988 98:194-211
Link
NIOSHTIC No.
10011757
Abstract
This report describes a study on postcollapse lavas of the infiernito caldera grade stratigraphically upward from nearly aphyric, high-silica rhyolite (76% sio2) to highly prophyritic trachyte (62% sio2). Plagioclase, clinopyroxene, orthopyroxene, magnetite, ilmenite, and apatite occur as phenocrysts throughout the sequence. Sanidine, biotite, and zircon are present in rocks with more than about 67% sio2. Major and trace elements show continuous variations from 62 to 76% sio2. Modeling supports fractional crystallization of the observed phenocrysts as the dominant process in generating the chemical variation.
Publication Date
19880101
Document Type
IH; Final Contract Report;
Fiscal Year
1988
NTIS Accession No.
NTIS Price
Identifying No.
MIR 7-88
NIOSH Division
WO;
Source Name
Contrib. Mineral Petrol., V. 98, 1988, PP. 194-211
State
TX;
Performing Organization
Univ. TX--austin
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