Geochemistry and Sr-Nd-Pb Istopic Features of the Ganlongtang-Nongba Ophiolite from the Changning-Menglian Suture Zone
详细信息
- 责任者：Lai Shaocong (State Key Laboratory of Continental Dynamics ; Department of Geology ; Northwest University ; Xi’an 710069 ; China) ; Qin Jiangfeng
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(11)
- 关键词：蛇绿岩 ; ophiolite ; 锶同位素 ; strontium isotopes ; 钕同位素 ; neodymium isotopes ; 铅同位素 ; lead isotopes ; 云南 ; Yunnan Province
- 页码：p.3195-3205
- 图表：4 illus., 2 tables, 33 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
This paper presents the major-and trace elements and Sr-Nd-Pb isotopes of the meta-basalts from the Ganlongtang-Nongba ophiolitic mélange which is situated at the middle part of the Changning-Menglian Paleo-Tethys suture zone. The Nongba basalts are mainly composed of alkaline and tholeiitic basalts. The Ganlongtang tholeiitic basalts show typical characteristics of N-MORB in terms of TiO2, Mg, K2O and LILEs, but have variable Sr-Nd-Pb isotopic compositions probably resulted from crustal contamination. It is proposed that the Changning-Menglian ancient ocean basin experienced a complete growth process from an embryonic to a mature ocean basin.