TRIASSIC ARAGONITE IN CARBONATE SOURCE-ROCK FROM RAGUSA BASIN (SICILY) - GEOCHEMISTRY, COMPARISON WITH RECENT SEDIMENTS AND ORIGIN

被引：0
|
作者：
LOREAU, JP
SABBADINI, S
BROSSE, E
FRIXA, A
机构：
[1] UNIV BOURGOGNE, CTR SCI TERRE, F-21000 DIJON, FRANCE
[2] CNRS, URA 157, F-21000 DIJON, FRANCE
[3] INST FRANCAIS PETR, F-92500 RUEIL MALMAISON, FRANCE
[4] AGIP, I-20097 SAN DONATO MILANESE, ITALY
来源：
COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE II FASCICULE A-SCIENCES DE LA TERRE ET DES PLANETES | 1995年 / 321卷 / 02期
关键词：
ARAGONITE; LAMINITES; STRONTIUM; MAGNESIUM; STABLE ISOTOPES; DIRECT PRECIPITATION; TRIAS;
D O I：
暂无
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
Aragonitic muds from the upper Trias occur in laminites between two laminae rich in clays and/or organic matter. Two types of aragonite are identified. The first shows rod or needle morphology, with Sr content (9,300 ppm), delta(18)0 (-1.1 to -1.7) and delta(13)C (+2.1 to +2.8) mostly similar to aragonite of Recent sediments. It is not biodetrital in origin but results from direct precipitation at 22-30 degrees C in sea water with a Sr-m(2+)/Ca-m(2+) ratio very near to Recent values. The second aragonite showing greater prismatic crystals with inclusions of relics of rods and needles, a high content in strontium (15,800 ppm) and a negative delta(13)C (-13.0 a -14.4), is diagenetic.
引用
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页码：111 / 118
页数：8
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