Geochronological And Geochemical Characteristics Of The Lincang Complex Granite And Its Geological Significance,Yunnan Province | Posted on:2016-03-24 | Degree:Master | Type:Thesis | Country:China | Candidate:Q Li | Full Text:PDF | GTID:2480304895985919 | Subject:Geological Engineering | Abstract/Summary: | PDF Full Text Request | The Lincang granite is the largest complex batholith in the western Yunnan Province,which is crucial for understanding the tectonic processes and constraining on the closure of the Changning-Menglian Paleo-Tethys.Baseed on petrology,geochemistry,and isotopic U-Pb chronology,magmatic resource and tectonic setting have been discussed.Major results and understanding as follows:(1)The Permian granitic rocks have been recognized by research field.LA-ICP-MS U-Pb geochronology of the Lincang show that hornblende granodiorite has age of late Middle Permian(260.7 ± 1.2Ma),biotite monzogranite has age of early Early Triassic(251.9 ± 1.2Ma).(2)Mineralogical and geochemical characteristics indicate that the Middle Permian to Early Triassic rocks are mainly I-type granite,and the Late Triassic rock arre mainly S-type granite.(3)The Changning-Menglain Paleo-Tethys experienced a complex evolutionary history involving subduction of the oceanic plate from Early to Late-Permian,terrane-continent collision during late Permian to early Triassic,and post-collision evolution from the middle-to late-Triassic... | Keywords/Search Tags: | Sanjiang Tethys, Lincang granites, Geochemistry, Zircon U-Pb geochronology, Tethyan evolution | PDF Full Text Request | Related items |
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