本文選題：塔兒山-二峰山　切入點：矽卡巖型鐵礦　出處：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：塔兒山-二峰山矽卡巖型鐵礦位于山西省臨汾市,位于華北板塊中部太行山陸塊南部,與矽卡巖型鐵礦相關(guān)的閃長巖體LA-ICPMS鋯石U-Pb定年閃長質(zhì)巖體侵位年齡在128.7±3.0Ma~131.2±2.2Ma之間,這與華北地區(qū)其他矽卡巖鐵礦中巖體年齡基本一致,暗示它們可能與同一區(qū)域構(gòu)造事件有關(guān)。鋯石中大量繼承鋯石的出現(xiàn)(年齡集中在古元古代到中元古代)預(yù)示源巖漿與華北克拉通基底下地殼關(guān)系密切。本文通過對塔兒山-二峰山實地考察,結(jié)合前人的一些研究成果,確定該研究區(qū)與矽卡巖型鐵礦相關(guān)的閃長巖類巖石類型有:二長巖(斑狀石英二長巖)、二長閃長巖、閃長玢巖。巖石具斑狀結(jié)構(gòu),塊狀構(gòu)造,巖石礦物組成有斜長石、鉀長石、輝石、角閃石及副礦物榍石、磁鐵礦、鈦鐵礦和磷灰石等。閃長質(zhì)巖石樣品地球化學(xué)數(shù)據(jù)顯示:塔兒山閃長巖類屬于鈣堿性準(zhǔn)鋁質(zhì)閃長巖,二峰山閃長質(zhì)巖石屬于堿性準(zhǔn)鋁質(zhì)閃長巖。哈克圖解和Rb/Nd Rb圖解指示它們差異是由于熔融程度不同造成的。同時,它們也表現(xiàn)出較一致的地球化學(xué)特征,如偏低Si O2含量(57.17%~65.51%),高堿(Na2O=5.07%~6.72%,K2O=2.27%~6.77%),較低的Mg#、富集LILEs(Sr、Ba)和LREE,虧損Ni、Ta、Ti等高場強(qiáng)元素的特點。因此本文推測二峰山巖體的初始巖漿來自較低程度的源區(qū)熔融,而塔兒山巖體的初始巖漿來自略高程度的源區(qū)熔融。結(jié)合平順西安里、河南安林、山東萊蕪地區(qū)閃長巖類年代學(xué)、地球化學(xué)數(shù)據(jù)對比研究,本文認(rèn)為塔兒山-二峰山閃長巖體屬于華北克拉通大規(guī)模巖石圈減薄的產(chǎn)物,華北克拉通破壞在早白堊世延伸到了太行山中西部。由于東部邯邢地區(qū)古老下地殼的拆沉引發(fā)塔兒山-二峰山巖體位置的軟流圈地幔上涌,致使該區(qū)古老下地殼發(fā)生部分熔融,進(jìn)而在矽卡巖鐵礦形成過程中發(fā)揮了重要的作用。
[Abstract]:Tar 'ershan-Erfengshan skarn type iron ore deposit is located in Linfen City, Shanxi Province, and is located in the south of Taihang Mountain block in the middle of North China plate. The LA-ICPMS zircon U-Pb dating age of diorite associated with skarn type iron ore is between 128.7 鹵3.0 Ma and 131.2 鹵2.2 Ma. This is basically consistent with the age of other skarn iron ores in North China. It is suggested that they may be related to tectonic events in the same region. The occurrence of a large number of inherited zircons (ages concentrated from Paleoproterozoic to Mesoproterozoic) indicates that the source magma is closely related to the lower crust of the North China Craton. After a field visit to Mount Tal to Mount Erfeng, Combined with some previous research results, the diorite rock types related to skarn type iron ore in this study area are determined as follows: monzolite (porphyry quartz monzonite, diorite, diorite-porphyrite). The rocks have porphyry structure and block structure. The rock minerals consist of plagioclase, potassium feldspar, pyroxene, hornblende and accessory mineral sphene, magnetite, ilmenite and apatite. Erfengshan diorite belongs to alkaline quasicaluminous diorite. The Hark diagram and Rb/Nd diagram indicate that the difference is caused by the different melting degree. At the same time, they also show more consistent geochemical characteristics. If the content of Sio _ 2 is relatively low, 57.17% and 65.51%, the Na _ 2O _ 2 content is 5.07 and 6.72K _ 2O2.77, the lower Mg#and the enrichment of Lil Essilon Sr-Ba) and the LREE, depleted Ni _ Li _ Ta-Ti and other high field strength elements. Therefore, this paper speculated that the initial magma of the Erfengshan rock body originated from the lower melting of the source region. The initial magma of the Tal mountain body comes from a slightly higher degree of source melting. A comparative study of geochronology and geochemistry data of diorites in Pingshun Xi'an, Henan An Lin, Shandong Laiwu area, Shandong Province, China. In this paper, it is considered that the Tal 'ershan-Erfengshan diorite is the product of large-scale lithospheric thinning of the North China Craton. The North China Craton failure extended to the central and western Taihang Mountains in the early Cretaceous. Due to the collapse of the ancient lower crust in the Hanxing area in the east of China, it caused the upwelling of the asthenosphere mantle in the position of the Tal 'ershan-Erfengshan rock body, resulting in the partial melting of the ancient lower crust in this area. It plays an important role in the formation of skarn iron ore.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.31;P588.12

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