Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6440751 | Lithos | 2015 | 20 Pages |
Abstract
In this paper, geochronological and geochemical studies have been carried out on representative lithologies from the Gushan area to discuss their petrogenesis and geodynamic settings. The opx-bearing monzonitic gneisses (U-Pb zircon emplacement age of 2.17Â Ga) are high-K calc-alkaline to shoshonitic I-type rocks with trace-element magmatic arc signature. The trace elements, whole rock Sm-Nd and zircon Lu-Hf isotopes suggest that they were possibly derived from partial melting of Neoarchean lower crust (garnet amphibolite) in a continental arc. The protoliths of the garnet-bearing mafic granulites are inferred to have formed between 2.37 Ga and 1.95Â Ga, possibly at 2.2Â Ga. They show N-MORB geochemical affinity and were most likely produced by partial melting of spinel lherzolite in a mid-ocean ridge setting. Detrital zircons from one metapsammite sample (garnet-bearing quartzofeldspathic gneiss) yield nearly concordant 207Pb/206Pb ages ranging from 2.1Â Ga to 2.0Â Ga. In situ U-Pb and Hf isotopic data of zircons from the metapsammite sample support that the metasedimentary protoliths were probably derived from a mid-Paleoproterozoic continental arc. Three metamorphic age groups (1.95-1.93Â Ga, 1.86-1.83Â Ga, and 1.80Â Ga) are revealed by the opx-bearing monzonitic gneisses, garnet-bearing mafic granulites, garnet-bearing quartzofeldspathic gneiss, and sillimanite-garnet-K-feldspar gneiss. The predominant group (1.95-1.93Â Ga) is considered to record the age of near-peak granulite facies metamorphism. The 1.86-1.83Â Ga group may result from decompression or the thermal imprint of the collision between the Eastern and Western Blocks. The 1.80Â Ga group is consistent with the age (1.81Â Ga) of the ductile deformation of the garnet-K-feldspar mylonite, and is interpreted as the timing of a relatively rapid tectonic extension. Thus, the Paleoproterozoic Gushan mélange formed and evolved in a subduction-collision-exhumation process, and finally situated in a likely suture zone between the Eastern and Western blocks or sub-cratons.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geochemistry and Petrology
Authors
Luojuan Wang, Jinghui Guo, Peng Peng, Fu Liu, Brian F. Windley,