NDLI: U-Pb zircon dating of Early Paleozoic gabbro from the Nantinghe ophiolite in the Changning-Menglian suture zone and its geological implication

Content Provider	Springer Nature Link
Author	Wang, BaoDi Wang, LiQuan Pan, GuiTang Yin, FuGuang Wang, DongBing Tang, Yuan
Copyright Year	2012
Abstract	The Nantinghe ophiolite is located in the northern part of the Changning-Menglian suture zone in southeast Tibet. It is composed of meta-peridotite, cumulative gabbro, meta-gabbro, plagioclase amphibolite and meta-basalt. Zircon U-Pb dating of the cumulative gabbro gives concordant ages of 473.0±3.8 Ma and 443.6±4.0 Ma respectively, indicating the early and late episodes of mafic magmatisms during the Paleo-Tethys oceanic rifting. The 16 LA-ICPMS zircon U-Pb analyses of meta-gabbro yield a weight mean age of 439±2.4 Ma. The gabbro shows relatively low contents of SiO$_{2}$ (46.46%–52.11%), TiO$_{2}$ (0.96%–1.14%) and K$_{2}$O (0.48%–0.75%). Its trace element distribution patterns are partly similar to those of the mid-ocean ridge basalts, and part is depleted in high field strength elements such as Nb, Ta, Zr, Hf and Ti. These features suggest that the mafic rocks were probably formed in a MORB-like or backarc rift basin setting. The zircon U-Pb age of gabbro is consistent with a late crystallization age of the cumulative gabbro from the Nantinghe ophiolite, suggesting that the Paleo-Tethys oceanic basin was opened during 444–439 Ma, possibly as a backarc basin. It is the first precise age which defines the formation time of the early Paleozoic ophiolite in the Changning-Menglian suture zone. These geochronological and geochemical characteristics of the Nantinghe ophiolite are consistent with those from the Guoganjianianshan and Taoxinghu of the Longmu Co-Shuanghu suture in the Qiangtang region. Thus, we suggest that the both Changning-Menglian and Longmu Co-Shuanghu sutures were probably transformed from the relic oceanic crust of the uniform Paleo-Tethys, which likely represents the original and main Paleo-Tethys oceanic basin.
Starting Page	920
Ending Page	930
Page Count	11
File Format	PDF
ISSN	10016538
Journal	Chinese Science Bulletin
Volume Number	58
Issue Number	8
e-ISSN	18619541
Language	English
Publisher	SP Science China Press
Publisher Date	2012-10-17
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	Changning-Menglian suture zone Longmu Co-Shuanghu suture zone Nantinghe Early Paleozoic cumulative gabbro Science Life Sciences Physics Chemistry/Food Science Earth Sciences Engineering
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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