THE BOLIVIAN TIN PROVINCE AND REGIONAL TIN DISTRIBUTION IN THE CENTRAL ANDES - A REASSESSMENT

被引：107
作者：
LEHMANN, B
ISHIHARA, S
MICHEL, H
MILLER, J
RAPELA, C
SANCHEZ, A
TISTL, M
WINKELMANN, L
机构：
[1] GOVT IND RES INST,SENDAI 983,JAPAN
[2] OPEN UNIV,DEPT EARTH SCI,MILTON KEYNES MK7 6AA,BUCKS,ENGLAND
[3] CTR INVEST GEOL,RA-1900 LA PLATA,ARGENTINA
[4] UNIV MAYOR SAN ANDRES,LA PAZ,BOLIVIA
[5] INGEOMINAS AA,MISION GEOL ALEMANA,MEDELLIN 65160,COLOMBIA
[6] MISION GEOL ALEMANA,LIMA,PERU
来源：
ECONOMIC GEOLOGY AND THE BULLETIN OF THE SOCIETY OF ECONOMIC GEOLOGISTS | 1990年 / 85卷 / 05期
关键词：
D O I：
10.2113/gsecongeo.85.5.1044
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：
Tin distribution patterns in granitic and rhyolitic rock suites from the central Andes (northern Chile, northwestern Argentina, Bolivia) imply a regionally variable bulk tin distribution coefficient, with systematic tin enrichment trends as a function of magmatic evolution in the Bolivian tin belt, and little or no tin enrichment outside of the tin province. The tin enrichment trends in the igneous rocks of the Bolivian tin belt can be understood as a consequence of the ilmenite series affiliation of these rocks, i.e., their low oxidation state, and of fractional crystallization. A geochemical tin anomaly in either the source or the country rocks of the Bolivian tin granites and tin porphyries is not likely. The tin ore deposits are seen as a result of effective hydrothermal redistribution (fo2 below to magnetite-pyrite-pyrrhotite buffer) of magmatically preenriched tin in a shallow environment.
引用
收藏
页码：1044 / 1058
页数：15
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