CaltechAUTHORS
  A Caltech Library Service

Textural and spectrochemical studies of the White Tank quartz monzonite, California

Rogers, John J. W. (1958) Textural and spectrochemical studies of the White Tank quartz monzonite, California. Geological Society of America Bulletin, 69 (4). pp. 449-464. ISSN 0016-7606. https://resolver.caltech.edu/CaltechAUTHORS:20140806-145536002

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20140806-145536002

Abstract

Magmatic crystallization of the White Tank quartz monzonite, California, has produced two sequences of differentiation. One sequence is marked by an increase in the size of potassium feldspar crystals and an increase in the Ab/An ratio of the plagioclase from the older toward the younger rocks. The second sequence is marked by an increase in the Ab/An ratio of the plagioclase from the older toward the younger rocks and by the presence of primary muscovite and garnet in the younger rocks. Textures vary with position in the intrusions. Quartz forms aggregates of several grains except near the margins of the intrusions, where it occurs as individual grains. Large potassium feldspar crystals that formed late in the first differentiation sequence are gray, grid-twinned, and commonly intergrown with sodic plagioclase; the earlier-crystallizing grains are pink, poorly twinned, and exhibit no such intergrowth. The more calcic plagioclase grains are zoned and imperfectly twinned, whereas the more sodic grains are twinned and poorly zoned. Biotite and most accessory minerals occur in aggregates, but sphene is scattered through the rock. In the first differentiation sequence the amounts of lead and possibly strontium in the potassium feldspar decrease from older to younger rocks, and the amounts of barium and rubidium remain constant. In the second sequence, the amounts of barium, lead, and strontium in the potassium feldspar decrease during differentiation, and the amount of rubidium is constant.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1130/0016-7606(1958)69[449:TASSOT]2.0.CO;2DOIArticle
http://bulletin.geoscienceworld.org/content/69/4/449PublisherArticle
Additional Information:Copyright © 1958, The Geological Society of America, Inc. Received February 5, 1957.
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological Sciences811
Issue or Number:4
Record Number:CaltechAUTHORS:20140806-145536002
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140806-145536002
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48128
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:06 Aug 2014 22:10
Last Modified:03 Oct 2019 07:00

Repository Staff Only: item control page