地质科技情报2012，Vol.31Issue(2)：1-8,8.
塔里木板块东北部笔架山东基性—超基性岩体地球化学特征与岩石成因
Geochemical Characters and Petrogenesis of the Bijiashandong Basic-Ultrabasic Intrusion, NE Tarim Plate
摘要
Abstract
The Bijiashandong basic-ultrabasic intrusion, located in the Beishan area in Xinjiang, northeastern Tarim plate, is the most eastern intrusion of Bijiashan belts. The intrusion is oval-shaped and outcrops about 5km2. The main kinds of the rocks are feldspathic wehrlite, olivine gabbro, olivine-bearing gabbro, gabbro and diabase. The rocks containing olivine are tholeiitic series and the gabbros are calc-alkalic series. Petrography, petrochemistry and geochemistry characters indicate the fractional crystallization of olivine, pyroxene and plagioclase in magma evolution. Nd, Sr, Pb isotopic compositions and lithogeochemical characteristics imply the exchange of material between the magma and the wall-rocks. It is proved that the primitive magma of Bijiashandong intrusion was high-Mg tholeiitic magma (MgO=ll. 2%) and derived from an OIB-like mantle source, which are similar to other basic-ultrabasic intrusions of Permain in the northeastern Tarim plate, indicating that these intrusions were mainly derived from an OIB-like mantle source and could be related to mantle plume.关键词
笔架山东岩体/同化混染/分离结晶/岩浆源区/新疆Key words
Bijiashandong intrusion/ contamination/ fractional crystallization/ magmatic source/ Xinjiang分类
天文与地球科学引用本文复制引用
夏昭德,夏明哲,王垚,姜常义,凌锦兰..塔里木板块东北部笔架山东基性—超基性岩体地球化学特征与岩石成因[J].地质科技情报,2012,31(2):1-8,8.基金项目
国家自然基金项目(40872070) （40872070）
中国地质调查局地质调查项目(1212011120498) （1212011120498）
中央高校基本科研业务费专项资金(CHD2010ZY008) （CHD2010ZY008）
