| 陕西山阳地区上泥盆统桐峪寺组重力流沉积 |
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| 引用本文： | 梁金哲,李文厚.陕西山阳地区上泥盆统桐峪寺组重力流沉积[J].沉积与特提斯地质,1991,11(1):27-34. |
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| 作者姓名： | 梁金哲 李文厚 |
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| 作者单位： | 西北大学地质系，西北大学地质系 |
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| 摘 要： | 近二十年来,对沉积物重力流及其沉积物的研究已引起国内外沉积学界的广泛重视,无论在理论研究还是在实际应用方面,均取得了不少成功的经验,著述甚多。1987年以来,笔者对秦岭造山带中的刘岭群进行了详细的观察研究,首次在上泥盆统桐峪寺组发现一套以颗流、浊流为特征的重力流沉积组合。这一发现对整个刘岭群的沉积环境与沉积相研究具有重要意义,为秦岭造山带的形成与演化及大地构造格局研究提供了有力的沉积学依据。
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GRAVITY-FLOW DEPOSITS IN THE UPPER DEVONIAN TONGYUSI FORMATION,SHANYANG,SHANXI. |
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| Liang Jinzhe,Li Wenhou.GRAVITY-FLOW DEPOSITS IN THE UPPER DEVONIAN TONGYUSI FORMATION,SHANYANG,SHANXI.[J].Sedimentary Geology and Tethyan Geology,1991,11(1):27-34. |
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| Authors: | Liang Jinzhe Li Wenhou |
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| Institution: | Department of Geology, Northwest China University |
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| Abstract: | The Liuling Group situated between the Shangdan fault and Shanyang-Fengxian fault in the Qinling orogenic belt represents a succession of EW-trending thick clastic rocks and claystones interbedded with carbonate rocks. The gravity-flow deposits dominated by the grain-flow deposits and turbidity-current depsoits are well-developed in the middle and upper portions of the Upper Devonian Tongyusi Formation. The grain-flow deposits are composed of massive conglomerates, gravelbearing coarse-grained sandstones and massive coarse-grained sandstones. The conglomerates and gravel-bearing coarse-grained sandstones tend to display normal grading, inverse grading and inverse-to-normal grading, and the pebbles from them to show imbricate arrangement. The turbiditycurrent deposits comprise a sequence of rhythmically bedded moderate-to thin-bedded sandstones, siltstones and slates. The sandstones and siltstones are characterized by sharp basal contacts and gradual top contacts, typical flute casts, graded bedding, parallel bedding and ripple cross-bedding. Individual beds are steady and may be traced for a long distance. The formation of the gravityflow deposits can be explained by submarine fan models. Different types of the gravity-flow deposits may reflect the features of various parts of a submarine fan. The palaeocurrent data show that the regional palaeoslopes point to the north rather than to the south. Like the Devonian sediments south of the Shanyang-Fengxian fault, the typical continental margin sedimentary formations recognized in the Liuling Group are also interpreted as the northern ancient passive continental margin sediments of the Yangzi plate and then together with the Yangzi plate, subducted towards the North China plate during the Hercynian-Indosinian, and lastly at the end of the Indosinian, intense intercontinental collision orogenesis occurred. Thus the Liuling Group constitutes an important part of the Qinling continental orogenic belt. |
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