摘要
川西盐源地区马丝缧和干沟两个碳酸岩杂岩体位于盐源-丽江推覆构造带的茶铺子-巴折脆-韧性断裂带内。根据两个杂岩体的地质分布、产状、岩石矿物共生组合、围岩蚀变类型等特征,确认其具有岩浆侵入体的典型特征,非前人划分的变质沉积碳酸盐岩。这两个碳酸岩杂岩体与冕宁-德昌稀土成矿带的其他碳酸岩-碱性岩杂岩体有类似的特征。在茶铺子-巴折一带也发现了明显的多金属、稀土、铀等矿化。这一发现为盐源-丽江推覆构造带的大地构造演化和区域成矿系统研究提供了重要的资料,为寻找类似于牦牛坪的稀土等矿床提供了重要线索。
The Masilei and Gangou carbonatite intrusive complexes were discovered in the Yanyuan area of western Sichuan based on geological and mineralogical investigations. Tectonically, the two complexes are located in the Chapuzi-Bazhe brittle-ductile fault of the Yanyuan-Lijiang Nappe Belt. The carbonatite complexes are veins in shape without fossil, and intruded the wall rocks. The rocks are mainly composed of calcite, plagioclase, rutile and exhibit magmatic crystallization structure. In addition, lamprophyre and diabase dykes occurring along the fault belts are also found in the adjacent area. The distribution, occurrence, rock association, mineral paragenesis and wall-rock alteration of the two complexes, argue that they are igneous carbonatite intrusives rather than the metamorphic sedimentary carbonate rocks previously suggested. Both of them are similar to the other carbonatite-alkaline igneous complexes along the Mianning-Dechang Rare Earth Element （REEs） Metallogenic Belt. The polymetallic, rare earth, uranium mineralization is also found in the Chapuzi-Bazhe Zone. Therefore, the discovery of the two carbonatite intrusive complexes provided new evidence for the tectonic evolution and regional metallogenic system along the Yanyuan-Lijiang Nappe Belt, and new clue for the prospecting of the Maoniupingt-Type Deposit.
出处
《大地构造与成矿学》
EI
CAS
CSCD
北大核心
2014年第1期131-139,共9页
Geotectonica et Metallogenia
基金
中国博士后科学基金项目(编号:2011M501432)资助
关键词
碳酸岩
岩石学
盐源
川西
carbonatite
petrology
Yanyuan
western Sichuan
