本文選題：寶力高廟組　切入點(diǎn)：火山巖　出處：《中國(guó)地質(zhì)》2017年06期 　論文類型：期刊論文

【摘要】：內(nèi)蒙古東烏旗巴彥敖包一帶出露的寶力高廟組地層可劃分為三段,可對(duì)應(yīng)于查干敖包剖面二、三、四段。二段為一套雜色中酸性火山熔巖和火山碎屑巖類,火山噴發(fā)以噴溢相為主;三段為一套灰黃、灰白色火山-沉積碎屑巖類和陸源沉積巖,含Annularia植物化石,為火山間歇期沉積;四段為一套灰色、淺灰色酸性熔巖夾少量火山-沉積碎屑巖,火山噴發(fā)以溢流相為主。四段紫紅色含晶屑流紋巖和二段灰黑色流紋巖鋯石LA-ICP-MS U-Pb年齡分別為(305±4.1)Ma和(315.2±4.6)Ma,結(jié)合所含化石確定地層時(shí)代為晚石炭晚期—早二疊世早期。寶力高廟組中酸性火山巖為安山質(zhì)、英安質(zhì)、流紋質(zhì)高鉀鈣堿性-鉀玄巖系列火山巖組合,巖石呈現(xiàn)富硅、堿,貧鈣、鎂,A/NK值和Fe Ot/Mg O值高,富Rb、Nb,貧過渡族元素,并具有顯著的銪負(fù)異常,為A2亞類花崗巖類,其可能是幔源巖漿底侵形成的晚古生代新生下地殼物質(zhì)部分熔融而成,巖漿演化經(jīng)歷了鈦鐵礦物、鐵鎂礦物及斜長(zhǎng)石分離作用。寶力高廟組中酸性火山巖形成于后碰撞構(gòu)造背景環(huán)境,其特征揭示興蒙造山帶內(nèi)蒙古東烏旗地區(qū)晚石炭世—早二疊世已處于同碰撞-碰撞后階段,早二疊世已經(jīng)進(jìn)入碰撞后伸展階段。
[Abstract]:The strata of the Baoligaomiao formation exposed in the area of Bayan Aobo, Dongwu Banner, Inner Mongolia, can be divided into three sections, corresponding to the second, third and fourth sections of the Chagan Aobo section. The second member is a set of variegated intermediate-acid volcanic lava and pyroclastic rocks. The third member consists of a set of greyish yellow, grayish-white volcanic-sedimentary clastic rocks and land-based sedimentary rocks, containing Annularia plant fossils, which are deposited intermittently in volcanoes, and the fourth member is a set of gray. Light gray acid lava with a small amount of volcanic-sedimentary clastic rock, The LA-ICP-MS U-Pb age of zircon from the fourth member of the fuchsia and the second member of the gray-black rhyolite is about 305 鹵4.1 Ma and 315.2 鹵4.6 Ma, respectively. The late late Carboniferous to early Permian age was determined by the fossils. The intermediate-acid volcanic rocks of Ligaomiao formation are Anshan. A series of volcanic rock assemblages rich in silicon, alkali, calcium, magnesium, and Fe Ot/Mg O, rich in RB and NB, poor in transition elements, and with significant europium negative anomalies, belonging to A _ 2 subtype granitoids, the rocks are rich in silicon, alkali, calcium, magnesium, and Fe Ot/Mg _ O, and are characterized by negative europium anomalies. It may be formed by the partial melting of the materials of the lower crust formed by the late Paleozoic magma transgression, and the magma evolution has undergone the ilmenite material. The intermediate-acid volcanic rocks of the Baoligaomiao formation were formed in the post-collision tectonic setting. Their characteristics indicate that the late Carboniferous to early Permian in the Dongwuqi area of the Xingmeng orogenic belt is already in the same collision-post-collision stage. The early Permian has entered the post-collision extension stage.
【作者單位】： 中國(guó)地震局地質(zhì)研究所;北京市地質(zhì)調(diào)查研究院;北京市地質(zhì)礦產(chǎn)勘查開發(fā)局;
【基金】：中國(guó)地質(zhì)調(diào)查局項(xiàng)目“內(nèi)蒙古1∶5萬巴彥塔拉幅、蘇勒敖包(恩格爾珠如和音呼都格)幅、巴彥敖包幅、巴彥呼勒幅區(qū)域地質(zhì)調(diào)查(1212011120699)資助~~
【分類號(hào)】：P588.14

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本文編號(hào)：1624061