CAJ | 학술논문

运用岩性一岩相和地球化学方法对东乌旗满都胡地区中晚泥盆世塔尔巴格特组碎屑岩进行了研究，探讨了其碎屑岩岩相、物源区及地球化学特征，将区内塔尔巴格特组划分为2种沉积相、5种沉积亚相。地球化学分析结果表明：塔尔巴格特组砂岩和泥岩具高SiO2、K20和A12O3／（Na2O＋CaO）值，低CaO含量特征，其碎屑物质来源于相对稳定的大陆源区；稀土元素配分曲线具轻稀土富集，重稀土比较平坦，轻重稀土分留明显，砂岩（La／Yb）N=6．66～11．15，平均值为9．01，泥岩（La／Yb）N=4．7～7．39，平均值为6．14，并伴有明显的Eu负异常。在La-Th—Sc、Th—Sc—Zr／10构造环境判别图解中，多数落入被动大陆边缘区域；主量元素构造判别图中也显示具有被动大陆边缘和活动大陆边缘的特征。结合区域分析，笔者认为塔尔巴椿特组碎届岩形成干被动大陆边缘环境。
운용암성일암상화지구화학방법대동오기만도호지구중만니분세탑이파격특조쇄설암진행료연구，탐토료기쇄설암암상、물원구급지구화학특정，장구내탑이파격특조화분위2충침적상、5충침적아상。지구화학분석결과표명：탑이파격특조사암화니암구고SiO2、K20화A12O3／（Na2O＋CaO）치，저CaO함량특정，기쇄설물질래원우상대은정적대륙원구；희토원소배분곡선구경희토부집，중희토비교평탄，경중희토분류명현，사암（La／Yb）N=6．66～11．15，평균치위9．01，니암（La／Yb）N=4．7～7．39，평균치위6．14，병반유명현적Eu부이상。재La-Th—Sc、Th—Sc—Zr／10구조배경판별도해중，다수락입피동대륙변연구역；주량원소구조판별도중야현시구유피동대륙변연화활동대륙변연적특정。결합구역분석，필자인위탑이파춘특조쇄계암형성간피동대륙변연배경。
On the basis of the analysis of lithology - lithofacies and geochemical characteristics of clastic rock of the Devonian Tarbaget Fm. in the Manduhu Area, east Ujimqin Qi of Inner Mongolia, the lithofacies, source ar-ea, and geochemistry of the clastic rock have been discussed. There are 2 sedimentary facies, 5 sub-facies to be recognized in it. The geochemical sample texting indicate that the clastic rock is rich in SiO2,1〈220, high A1203/ (Na20+CaO), and low CaO. The fragments are from relatively stable continent. The REE patterns are character-ized by LREE enrichmen, HREE lat, LREE and HREE fractional distillation is obvious. (La/Yb)N =6.66 - 11.15 (average 9.01 )in the standstone, (La/Yb)N=4.7 - 7.39 (average 6.14)in the mud rock with strong negative Eu ab- normily. In both La-Th-Sc and Th-Sc-Zr/10 discriminate diagrams, almost all of the chastic rock plots fall in the passive continental margin field, and the major element discrimination diagram of the clastic sediments show they are from passive continental margin or active continental margin. With the regional geology analysis, the au-thors suggest that the tectonic setting of the clastic rock of the Devonian Tarbaget Fm. is a passive continental margin.