AGE AND GEOMORPHIC HISTORY OF METEOR CRATER, ARIZONA, FROM COSMOGENIC CL-36 AND C-14 IN ROCK VARNISH

被引：77

作者：

PHILLIPS, FM

ZREDA, MG

SMITH, SS

ELMORE, D

KUBIK, PW

DORN, RI

RODDY, DJ

机构：

[1] UNIV ROCHESTER,NUCL STRUCT RES LAB,ROCHESTER,NY 14627

[2] ARIZONA STATE UNIV,DEPT GEOG,TEMPE,AZ 85287

[3] US GEOL SURVEY,FLAGSTAFF,AZ 86001

来源：

GEOCHIMICA ET COSMOCHIMICA ACTA | 1991年 / 55卷 / 09期

关键词：

D O I：

10.1016/0016-7037(91)90387-K

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Using cosmogenic Cl-36 buildup and rock varnish radiocarbon, we have measured the exposure age of rock surfaces at Meteor Crater, Arizona. Our Cl-36 measurements on four dolomite boulders ejected from the crater by the impact yield a mean age of 49.7 +/- 0.85 ka, which is in excellent agreement with an average age of 49 +/- 3 ka obtained from thermoluminescence studies on shock-metamorphosed dolomite and quartz. These ages are supported by undetectably low C-14 in the oldest rock varnish sample.

引用

页码：2695 / 2698

页数：4

共 23 条

[1] STABLE CARBON ISOTOPE RATIOS OF ROCK VARNISH ORGANIC-MATTER - A NEW PALEOENVIRONMENTAL INDICATOR [J].