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The Geochemic Characteristics And Geodynamic Significance Of The Granite In Wenduermiao Uplift Zone In Inner Mongolia

Posted on:2011-04-28Degree:MasterType:Thesis
Country:ChinaCandidate:J L XingFull Text:PDF
GTID:2120360305954982Subject:Structural geology
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Wenduermiao's uplift zone is mainly based on erlian basin of tectonic division to differentiate, It belongs to The tectonic units in the Mesozoic and Cenozoic. Before this, it belongs to the early palaeozoic epicontinental hyperplasia &model north. The epicontinental hyperplasia can be divided into subduction zones, the island and back-arc basin from north to souththe island mainly developed in Baerhantu Bainaimiao and Balinyouqi and so on in the south of the subduction zones, white is the power sweat, etc, It with sedimentary type volcanic island - is the Bainaimiao.Bainaimiao Group is mainly composed of two lithologic section. The under section is mainly composed ofpyroclastic rocks. Mainly of the mount zion and volcanic tuff qualitative hydrofracturing breccia.It's defacted by the photograph by green schists metamorphism reformation. The formation of the main for inclined helical schist detris detris long long schist and so on..The upper primary composed by acid pyroclastic rocks. In the metamorphic siltstones muddy limestone lens coral fossils found in late, which should belong to Silurian. In the island, developing mainly the deep into the intrusive rocks.Back-arc basin mainly developed in the south island. It is a complex lidan contribution main representative.Hu Xiao(1990) named it XuNi WuSu group.It mainly completed by the under complex lidan contribution and upper complex lidan contribution. It with the Bainaimiao Group as angular unconformable contact,the same as with the Late silurian that qing group grinding ShiJianZao pull. Coral fossils extensively developed in Xuniwusu Group. This chain between the nests of coral corals and proved belong to product of late Silurian.Therefore, the region in the early Paleozoic period is a including subduction zones , the island and the complete back-arc basin, the arc basin structure system.. Wenduer temple's uplift all is relatively erlian basin formation and evolution of the division, and generation of tectonic units.Through all of the four main rock's temple uplift of rock samples petrology, geochemistry and the chronology of research in Wenduer temple,get the four major granite rock petrology, the quantity and the rare earth trace petrologic characteristic.And through the field observation and indoor experiments,get the age of the four rock.1.Xinmin terrace formed from 426-452Ma that belongs to late Silurian Epoch.Its rock association include granodiorite,quartz diorite and tonalite.It belongs to peraluminous,calc alkali granite. ,LREE enrichment,HREE deficit,LREE/HREE is 8-13, The degree of HREEand LREE fractionation is obvious. LaN/YbN is 8-17,it has Eu positive anomaly,δEu为1.1-2.2, that means the fractional crystallization of feldspar is unconspicuous.2.Daolanghuduge terrace formed from 265-269.5Ma that belongs to Middle Permian, Its rock association include monzonite granite,granodiorite and quartz diorite. .It also belongs to peraluminous,calc alkali granite. It has mild Eu positive anomaly or not,δEu is 0.96-1.16.The feature of Earth's dynamics,LREE enrichment,HREE deficit, (La/Yb)N is 6-8, The degree of fractionation is weak.3.Narenwula terrace and baiqi terrace formed from 134.9-144.9Ma, Its rock association include muscovite alkali granite,Monzonite granite and granite porphyry. .It belongs to aluminious high potassium alkaline calcium granite. ,LREE enrichment,HREE deficit.Rb,Th and so on enrichment.It belongs to the type of REE enrichment.4. Rock Hill Caledonian granite belong to I-type volcanic arc granite, which formedinthe period of Uplift after collision.hercynian monzonite granite also belong to I-type volcanic arc granite, which formedinthe period of Uplift after collision. Yanshanian granite belong to A-type granite which are the product intraplate anorogenic environment.It related to the activity of Early Cretaceous Epoch rift valley.5.The appear of Early cretaceous epoch A-type anorogenic continental rupture rift signs that Paleo-Asian Ocean structural domain complete transition to the Pacific tectonic domain.
Keywords/Search Tags:Uplift area in Wenduer temple, Ptrological, Geochemical, Chronology
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