PROTEROZOIC GEOCHRONOLOGICAL AND ISOTOPIC BOUNDARY IN NW ARIZONA

被引：38

作者：

CHAMBERLAIN, KR

BOWRING, SA

机构：

[1] Dept Earth & Planetary Sciences, Washington Univ, St. Louis

来源：

JOURNAL OF GEOLOGY | 1990年 / 98卷 / 03期

关键词：

D O I：

10.1086/629412

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

U-Pb ages determined from zircon, sphene, and apatite in conjunction with Pb isotopic analyses of alkali feldspar establish a regional geochronological framework and constrain the location of a major north-trending Proterozoic crustal boundary in northwestern Arizona. Two regions west of the boundary (Hualapai Mountains and Lost Basin Range-Garnet Mountain) are characterized by complex U-Pb zircon systematics, evidence for inheritance of an older zircon component (1.8-2.3 Ga), and elevated 207Pb/204Pb from feldspars compared to the east. We interpret the boundary to be a suture related to convergence of terranes c1.68-1.70 Ga which was reactivated by younger uplift. -from Authors

引用

页码：399 / 416

页数：18

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