東昆侖東段香加南山花崗巖基中加魯河中基性巖體形成時(shí)代、成因及其地質(zhì)意義
[Abstract]:The main rock types of the central Jialu River basic rock body in the Xiangganshan granite base in the eastern part of East Kunlun Mountains include hornblende gabbro and quartz diorite. LA-ICP-MS zircon U-Pb isotopic dating results show that the Jialu River middle basic rock body Age of crystallization 220 Ma. The content of SiO_2 in rock mass is relatively low, 47.91 and 58.92. The content of Al2O3 is 15.54 / 18.35 and the value of Na _ 2O is 1.70 and 3.34. The K2O value is 0.58 and 1.92 respectively. The ratio of Na _ 2O / K _ 2O is 1.342.93, The average content of 1.92% MgO is 3.69 and the content of MgO is 461.The saturation index of aluminum (A/CNK) is between 0.70 and 0.90, and the main body belongs to the calc-alkaline series of potassium in quasi-aluminite. The rock mass is enriched in light rare earth elements, depleted in heavy rare earth elements, with obvious Eu negative anomaly (未 Eu=0.40~0.59), and enriched in Rb,Th,Ba and other large ion lithophile elements, such as (LILE), which is depleted in high field strength elements such as Nb,Ta,Ti. Petrological and geochemical studies show that the rock mass experienced two magmatic mixing processes in the deep and shallow crust. In the deep part of the lower crust, the mantle magma underplating causes the partial melting of the lower crust to form felsic magma. The two magmas are mixed in different proportions and are chemically diffused and homogenized, thus having similar isotopic and petrogeochemical characteristics. In shallow crust, magma is injected into granitic magma through deep mixed magma, magma edge is completely mixed with granite to form quartz diorite in Kaluhe rock body, while incomplete mixing forms dark color microparticle inclusion. The study of the basic rock bodies in the middle Kalu River shows that the eastern part of East Kunlun is in the post-collision stage of PaleoTethys evolution in the late Triassic, and there are magmatic underplating events in this period.
【作者單位】: 長(zhǎng)安大學(xué)地球科學(xué)與資源學(xué)院西部礦產(chǎn)資源與地質(zhì)工程教育部重點(diǎn)實(shí)驗(yàn)室國(guó)土資源部巖漿作用與找礦重點(diǎn)實(shí)驗(yàn)室;南陽(yáng)理工學(xué)院土木工程學(xué)院;中國(guó)地質(zhì)大學(xué)(北京)地球科學(xué)與資源學(xué)院;山西師范大學(xué)地理科學(xué)學(xué)院;
【基金】:國(guó)家自然科學(xué)基金(41472191、41502191、41172186、40972136) 中央高;究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金(310827161002、310827161006) 青海省國(guó)土資源廳-中國(guó)鋁業(yè)公司公益性區(qū)域地質(zhì)礦產(chǎn)調(diào)查基金(200801)聯(lián)合資助
【分類號(hào)】:P588.12
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