內(nèi)蒙古狼山地區(qū)侏羅系LA-ICP-MS碎屑鋯石U-Pb定年及其物源意義
[Abstract]:Based on the LA-ICP-MS U-Pb dating and geochemistry of detrital zircons, the source of Jurassic Shijiaodong Group in Dongsheng Miao, Langshan, Inner Mongolia was discussed. According to the age analysis of the available zircon, the peak age is mainly in the late Paleozoic (259~308Ma), followed by Gu Yuan (1.74~2.18Ga) and early Gu Yuan-NeoArchean (2.39~2.58Ga). The age of late Paleozoic age is the same as that of Hercynian magmatite, and the age distribution of Paleoproterozoic and NeoArchaean age is similar to that of Gu Yuan magmatic rock in Langshan area. The REE distribution characteristics of Jurassic sandstone are similar to that of Hercynian magmatic rocks, Wulashan group and Kongzi series. Based on the analysis of sample sheet and conglomerate of ShijiaoGroup, it is concluded that the Jurassic is a near-source sedimentary system, and its provenance mainly comes from the large-scale Hercynian magmatic rocks in the Langshan area, followed by the Kongzi rock belt in the Hetao area, and the Archean Ula Mountain Group in the Langshan area. Paleoproterozoic magmatic rocks and early-middle Triassic magmatic rocks may provide some provenances. In addition, according to the youngest age of the clastic zircon is 243Ma (Middle Triassic), combined with the study of the fossil assemblage of predecessors and the characteristics of the whole missing Triassic strata in Langshan area, it is concluded that the age of the strata should be the early and Middle Jurassic. The model of Jurassic sediment source in Langshan area is that the north and south sides are the provenance of uplift, the main provenance is the north side of Langshan uplift, and the south side of the uplift provides some provenances to the north, and there are some differences between different regions.
【作者單位】: 西北大學(xué)地質(zhì)學(xué)系;西北大學(xué)大陸動(dòng)力學(xué)國家重點(diǎn)實(shí)驗(yàn)室;中石油東方地球物理公司研究院長慶分院;西安地質(zhì)礦產(chǎn)勘查開發(fā)院;
【基金】:西北大學(xué)大陸動(dòng)力學(xué)國家重點(diǎn)實(shí)驗(yàn)室科技部專項(xiàng)項(xiàng)目(編號(hào):BJ08133-14BJ081334-2) 國家自然科學(xué)基金項(xiàng)目(批準(zhǔn)號(hào):4133031540902032) 國家科技油氣重大專項(xiàng)項(xiàng)目(編號(hào):2011ZX05023-001-002) 中國地質(zhì)調(diào)查局項(xiàng)目(編號(hào):12120114009201)
【分類號(hào)】:P534.52;P597.3
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