ALUMINOUS ENCLAVES IN GEDRITE-CORDIERITE GNEISS FROM SOUTHWESTERN NEW HAMPSHIRE

被引：57

作者：

ROBINSON, P

JAFFE, HW

机构：

来源：

AMERICAN JOURNAL OF SCIENCE | 1969年 / 267卷 / 03期

关键词：

D O I：

10.2475/ajs.267.3.389

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Gedrite-cordierite gneisses interbedded with other mafic rocks from Middle Ordovician Ammnoosuc Volcanics of Richmond, New Hampshire, contain aluminous enclaves in cordierite composed of kyanite, sillimanite, corundum, staurolite, spinel, and bytownite; original gedrite-kyanite- sillimanite gneisses reacted to form cordierite so that remnant aluminosilicates are nowhere in contact with dedrite; phase analysis using compositional information suggests that enclave assemblages resulted from continuous reactions which formed progressively more Fe-rich cordierite with changing pressures and temperature.

引用

页码：389 / &