本文選題：東昆侖造山帶　切入點(diǎn)：砂巖地球化學(xué)　出處：《現(xiàn)代地質(zhì)》2017年04期

【摘要】：東昆侖地區(qū)發(fā)育一套顯生宙碎屑巖地層,包括下寒武統(tǒng)沙松烏拉組、中—上奧陶統(tǒng)納赤臺(tái)群、上石炭統(tǒng)—下二疊統(tǒng)浩特洛哇組、下三疊統(tǒng)洪水川組、中三疊統(tǒng)希里科特組以及上三疊統(tǒng)八寶山組。研究區(qū)砂巖的CIA值反映沙松烏拉組砂巖源區(qū)化學(xué)風(fēng)化程度較高,其余各組砂巖源區(qū)化學(xué)風(fēng)化程度較低。主量和微量元素研究結(jié)果表明各組砂巖源區(qū)以長(zhǎng)英質(zhì)巖石為主,包含少量中性成分。La、Ce、Th、U、∑REE含量和La/Sc、Th/Sc、Sc/Cr、La/Y比值指示沙松烏拉組和納赤臺(tái)群砂巖沉積環(huán)境為大陸島弧或活動(dòng)大陸邊緣,浩特洛哇組砂巖形成于被動(dòng)大陸邊緣環(huán)境,洪水川組砂巖沉積環(huán)境為活動(dòng)大陸邊緣,希里科特組砂巖的微量元素含量及其比值接近于活動(dòng)大陸邊緣和被動(dòng)大陸邊緣,八寶山組砂巖沉積環(huán)境為活動(dòng)大陸邊緣。綜合分析認(rèn)為沙松烏拉組和納赤臺(tái)群砂巖形成于原特提斯洋俯沖階段,浩特洛哇組砂巖形成于古特提斯洋持續(xù)擴(kuò)張階段,洪水川組砂巖形成于古特提斯洋俯沖階段,希里科特組砂巖形成于陸(弧)陸初始碰撞階段,八寶山組砂巖形成于陸陸全面碰撞—碰撞后階段。
[Abstract]:A set of Phanerozoic clastic strata developed in the East Kunlun area, including the Lower Cambrian Shasongwula formation, the Middle-Upper Ordovician Nachitai Group, the Upper Carboniferous and Lower Permian Holterlova formation, and the Lower Triassic Flooguan formation,Middle Triassic Shiri Kurt formation and Upper Triassic Babaoshan formation.The CIA value of sandstone in the study area shows that the chemical weathering degree of sandstone source area of Shasong Wula formation is higher, and the chemical weathering degree of other sandstones source area is lower.The sandstones of the Haoterova formation were formed in the passive continental margin environment, the sedimentary environment of the sandstones of the Hongchuan formation was the active continental margin, and the trace element contents and their ratios of the sandstones of the Shiri Kot formation were close to the active continental margin and the passive continental margin.The sandstone sedimentary environment of Babaoshan formation is active continental margin.It is considered that the sandstones of the Shasongwula formation and the Nachitai group were formed in the original Tethys ocean subduction stage, the Haoterlova sandstone formed in the paleoTethys ocean continuous expansion stage, and the flood formation sandstone formed in the paleoTethys ocean subduction stage.The sandstones of the Shiri Kurt formation were formed at the initial collision stage of the continental (arc) land, and the sandstone of the Babaoshan formation was formed at the stage of comprehensive collision and post-collision of the continental land.
【作者單位】： 中國(guó)地質(zhì)大學(xué)(北京)地球科學(xué)與資源學(xué)院;中國(guó)地質(zhì)大學(xué)地質(zhì)過(guò)程與礦產(chǎn)資源國(guó)家重點(diǎn)實(shí)驗(yàn)室;青海省地質(zhì)調(diào)查院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41572062,U1303292) 中央返還兩權(quán)價(jià)款資金綜合研究項(xiàng)目(Y15-1-LQ04) 青海省地質(zhì)勘查基金項(xiàng)目(2016020003ky003)
【分類號(hào)】：P512.2;P548

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 石海巖;苗衛(wèi)良;馬海州;李永壽;張西營(yíng);嚴(yán)玲琴;馬維明;王振東;;云南思茅盆地白堊紀(jì)—古新世碎屑巖地球化學(xué)特征及地質(zhì)意義[J];現(xiàn)代地質(zhì);2016年03期

2 李瑞保;裴先治;李佐臣;裴磊;陳有p，

本文編號(hào)：1701647