西北地质2017，Vol.50Issue(2)：142-155,14.
柴北缘超高压变质带鱼卡榴辉岩型金红石矿地质特征及原岩性质探讨
Geological Characteristic and Protolith Nature of Yuqia Eclogite-type Rutile Depositin Northern Qaidam UHP Metamorphic Belt
摘要
Abstract
The Yuqia eclogite-type rutile deposit is the first large-super large rutile deposit discovered in Northern Qaidam ultra-high pressure metamorphic belt, which was related to the UHP eclogite.The flesh massive Ti-rich eclogite serves as the major ore-host rock for this rutile deposit, the rutile with four exiting state can be recognized in this deposit, representing for four different stages of formation and evolution, respectively.After the detailed field geological investigation and sampling, the eclogite-type rutile ore in the Yuqia deposit can be divided into high-grade ore (TiO2>2%) and low-grade ore (TiO2 < 1%~2%).The investigation results have shown that the high-grade ore are relatively depleted in SiO2 while they are enriched in TFeO, MnO and P2O5, with lower Al2O3/TiO2 ratios (<7) and higher content of total alkali (K2O + Na2O).Trace element characteristics indicate that the high-grade ore has the protolith characteristics of oceanic island basalt (OIB), but the protolith of low-grade ore was derived from the enriched type mid-ocean ridge basalts (E-MORB) in the intraplate environment.The different of protolith characteristics between Yuqia rutile ore with two types reflect the complexity of the tectonic evolution in Northern Qaidam ultrahigh pressure metamorphic belt.关键词
原岩性质/榴辉岩/金红石矿/超高压变质带/柴北缘/鱼卡Key words
protolith characteristics/eclogite/rutile ore/UHPM/Northern Qaidam/Yuqia分类
天文与地球科学引用本文复制引用
林成贵,许荣科,郑有业,陈鑫,王红军,白杰,范贤斌,方昌坦..柴北缘超高压变质带鱼卡榴辉岩型金红石矿地质特征及原岩性质探讨[J].西北地质,2017,50(2):142-155,14.基金项目
中国地质调查项目"青海省大柴旦镇绿梁山-双口山多金属矿调查评价"(12120113032800) （12120113032800）
