本文選題：測老廟坳陷 + 早白堊世��； 參考：《地質(zhì)論評》2017年02期

【摘要】：位于狼山以北的測老廟地區(qū)是內(nèi)蒙古西部巴音戈壁盆地群東部邊緣的次級坳陷,面積850 km~2,沉積主體為白堊紀陸相碎屑巖。在目前能夠搜集到的所有資料(包括內(nèi)部資料)中,前人在該坳陷內(nèi)的沉積相模式分析以及水文地質(zhì)研究等工作均認為:測老廟坳陷下白堊統(tǒng)巴音戈壁組的物源區(qū)主要是坳陷東南側(cè)的狼山,這意味著狼山在早白堊世就已經(jīng)隆起。幾十年內(nèi),這個模式一直作為指導(dǎo)思想影響著該地區(qū)找礦勘探方向,但找礦效果均不佳,造成了極大的財力、物力和人力資源的浪費。筆者等認為是這一模型存在問題,因為早白堊世巴音戈壁期狼山尚未隆起,無法充當測老廟坳陷的主要物源區(qū)。在沉積盆地分析中,利用古流向判別沉積巖的物源區(qū)方位是一種非常簡便、有效的研究方法,然而筆者等未找到前人在本研究區(qū)進行該項工作的記錄。筆者等在測老廟坳陷露頭區(qū)對巴音戈壁組碎屑巖進行了大規(guī)模的古流向測量工作:尋找發(fā)育波痕和前積紋層等沉積構(gòu)造為主的露頭48處,并依46組前積紋層和5組波痕測得共計51組數(shù)據(jù),利用野外現(xiàn)場恢復(fù)和室內(nèi)赤平投影的方法恢復(fù)其原始古流向,最終用玫瑰花圖和古流向分布圖展示測老廟坳陷早白堊世古流向格局。分析結(jié)果表明,測老廟坳陷在早白堊世巴音戈壁期的古流向以自北向南為主,向SE、SW兩個方向?qū)ΨQ遞減,集中分布在140°~210°的范圍內(nèi),甚至在緊靠狼山的區(qū)域,古流向垂直指向狼山山脈延伸方向。據(jù)此可以判斷:狼山不是巴音戈壁組碎屑巖的主要物源區(qū),狼山最早也應(yīng)在早白堊世巴音戈壁末期之后才可能隆起。這一研究結(jié)果為測老廟地區(qū)早白堊世沉積巖相關(guān)礦產(chǎn)的勘探開發(fā)提供了重要的科學(xué)依據(jù),為狼山隆起時代的研究提供了重要的突破點,同時也為沉積巖的古流向測量、恢復(fù)與物源區(qū)分析提供了成功的范例。
[Abstract]:Located to the north of Langshan, the Zhaolaimiao area is a sub-depression on the eastern margin of the Bayingbi basin in western Inner Mongolia, with an area of 850 km2. The main sedimentary body is Cretaceous continental clastic rock. Of all the information currently available, including internal information, The analysis of sedimentary facies models and hydrogeological studies in the depression by predecessors all suggest that the source region of the lower Cretaceous Bayingobi formation in the Shilao depression is mainly Langshan in the southeast side of the depression, which means that Langshan has been uplifted in the early Cretaceous. For several decades, this model has been used as a guiding ideology to influence the prospecting and exploration direction in this area, but the prospecting effect is not good, resulting in a great waste of financial, material and human resources. The author thinks that this model has some problems because the Langshan in the early Cretaceous Bayingobi period has not been uplifted and can not be used as the main provenance of the Zhaolaomiao depression. In the analysis of sedimentary basins, it is a very simple and effective research method to use paleodirection to determine the source area of sedimentary rocks. However, the author has not found the previous records of this work in this research area. In the outcrop area of the Zhaolaimiao depression, the authors have carried out a large-scale paleodirection survey of the clastic rocks of the Bayingobi formation: 48 outcrops with mainly depositional structures such as ripples and foregrained layers have been found. A total of 51 groups of data were obtained from 46 groups of pre-grained layers and 5 groups of ripples. The original ancient direction was recovered by field restoration and indoor projection. Finally, the early Cretaceous paleo-direction pattern of the Zhaolao depression was demonstrated by using the rose chart and the paleo-direction distribution map. The results show that the paleodirection of the early Cretaceous Bayingobi period in the Zhaolaimiao depression is mainly from north to south, and decreases symmetrically toward SENW, and is concentrated in the range of 140 擄~ 210 擄, even in the area close to Langshan. The ancient direction points vertically to the extending direction of the Langshan Mountains. It can be concluded that Langshan is not the main source of the clastic rocks of the Bayingobi formation, and that Langshan should be uplifted at the earliest after the end of the early Cretaceous Bayingobi. The results provide an important scientific basis for the exploration and development of sedimentary rocks related to the early Cretaceous in the Zhaolaimiao area, provide an important breakthrough point for the study of the Langshan uplift, and also provide an important basis for the measurement of the paleodirection of sedimentary rocks. Recovery and provenance analysis provides a successful example.
【作者單位】： 中國石油大學(xué)地學(xué)院;中國科學(xué)院南京地質(zhì)古生物研究所;中國地質(zhì)科學(xué)院地質(zhì)研究所;香港大學(xué)地球科學(xué)系;中國石油長慶油田勘探開發(fā)研究院;
【基金】：中陜核工業(yè)集團委托的研究項目“測老廟盆地區(qū)域地質(zhì)研究與鈾礦有利區(qū)帶預(yù)測”的成果
【分類號】：P534.53;P624

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