摘要:

The relationships of the Adirondack anorthosite and associated rocks have been reinvestigated. The order of intrusion is interpreted as anorthosite, gabbro, quartz‐syenite, diabase, granite, diabase (Keeweenawan). The evidence is clear that gabbro and quartz‐syenite formdikesin anorthosite, and it is believed that they also show evidences of chilling against anorthosite. The anorthosite‐magma has given rise to profound pyrometasomatic replacements of limestone country rock of a type peculiar to it. The metamorphosed rocks are locally injected by quartz‐plagioclase veinings related to the anorthosite. All the phenomena are consistent in indicating formation of the anorthosite through differentiation from a gabbroic anorthosite‐magma with a distinct content of volatiles. The hypothesis of a rest‐magma of the composition of the quartzsyenite on the one hand, squeezed out from an anorthositic fraction on the other, does not satisfy the requirements of t

ISSN:0002-8606    

DOI:10.1029/TR017i001p00255

年代:1936

数据来源: WILEY

摘要:

The intrusive core of the Sierra Nevada, California, is a composite mass, some 400 miles in length and locally more than 70 miles wide. In upper Jurassic time, It Intruded intensely folded Paleozoic and lower Mesozoic rocks. It trends northwest, parallel to the coast. Structure‐sections across this pluton have been surveyed by E. Cloos, near the center of the range (Yosemite Section), and in the north part (Dormer Section). A third profile (San Joaquin Section), about 25 miles south of Yosemite, has been studied recently by May

ISSN:0002-8606    

DOI:10.1029/TR017i001p00256

年代:1936

数据来源: WILEY

摘要:

Investigations concerning the problem of evaluating the stability relations of silicate systems containing volatile components are being carried out by the writer at pressures up to 4000 bars. The determination of the solubility relations of these systems is a necessary and important part of such a research.

ISSN:0002-8606    

DOI:10.1029/TR017i001p00257-4

年代:1936

数据来源: WILEY