Insights into the formation of San Clemente Basin, off Baja California, Mexico:: Lithological observations and geochemistry of marine minerals

被引：1
作者：
Aguirre-Bielschowsky, I.
Ledesma-Vazquez, J.
Daessle, L. W.
Rendon-Marquez, G.
机构：
[1] Univ Autonoma Baja Calif, Inst Invest Oceanol, Fac Ciencias Marinas, Ensenada, Baja California, Mexico
[2] Ctr Invest Cientif & Invest Super Ensenada, Dept Geol, Ensenada, Baja California, Mexico
来源：
MARINE GEORESOURCES & GEOTECHNOLOGY | 2007年 / 25卷 / 02期
基金：
美国国家科学基金会;
关键词：
California borderland; polymetallic crusts; phosphorite; rare earth elements;
D O I：
10.1080/10641190701372263
中图分类号：
P75 [海洋工程];
学科分类号：
0814 ; 081505 ; 0824 ; 082401 ;
摘要：
San Clemente Basin is part of the California Continental Borderland. Low temperature hydrothermal alteration is suggested for some minerals. Fe-Mn crusts are hydrogenetic (Fe/Mn = 0.83-1.14), with positive Ce anomaly, but no positive Eu anomaly that would suggest hydrothermal influence. Co is depleted (Co = 0.16-0.23%), probably due to dilution by a terrigenous component. The phosphorite is of high grade (P2O5 = 29%), with high Fe and Ca concentrations compared with other phosphorites from the Baja California Peninsula. It has a typical seawater-type REE pattern, and a significant negative Ce anomaly, which is indicative of outer shelf conditions for the San Clemente Basin during the Miocene. No lithologic evidence is found to suggest ophiolite-type rocks, as occurs in the nearby Santa Cruz and San Nicolas Basins.
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页码：119 / 128
页数：10
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