羌塘盆地东部冬曲地区上三叠统巴贡组沉积环境分析
|
摘要
羌塘盆地东部冬曲地区上三叠统巴贡组主要发育暗色细粒碎屑岩沉积。冬曲野外露头剖面巴贡组碎屑岩的岩性特征、沉积构造、概率累积曲线、粒度参数和C-M图等的分析结果表明:冬曲地区巴贡组砂岩总体较细,分选较差,概率累积曲线主要为"一段式",悬浮总体含量较高,跳跃总体和滚动总体较少;在C-M图上表现为与C=M基线平行的直线段;沉积构造发育深海—半深海复理石标志性的Paleodictyon古网迹遗迹化石。综合研究认为冬曲地区巴贡组为一套典型的远源滑塌浊积岩沉积。结合邻区巴贡组沉积特征,推测羌塘盆地晚三叠世具有多岛海的古地理格局。
The Upper Triassic Bagong Formation in Dongqu area of the eastern Qiangtang Basin is mainly composed of dark fine clastic rock. The lithologic characters, sedimentary structures, probability cumulative grain size curves, grain-size parameters and C-M pattern of the sandstones of Bagong Formation in Dongqu outcrop profile all show as follows: the sandstones is generally fine and poorly sorted, the probability cumulative curve of the sandstones mostly represents one-stage, with a high percentage of the suspension and low percentage of the traction and saltation. In the C-M diagram, a line segment parallel to the C=M baseline is represented. The sedimentary structure of Paleodictyon trace fossils,which is flysch marks of deep sea—moderate sea, developed in Bagong Formation.Based on the comprehensive analysis, it is concluded that the Bagong Formation is a typical set of far-source fluxoturbidite in Dongqu area. Combined with the depositional characteristics of Bagong Formation in adjacent area, it is inferred that a palaeogeographic pattern of archipelago in Late Triassic developed in Qiangtang Basin.
The Upper Triassic Bagong Formation in Dongqu area of the eastern Qiangtang Basin is mainly composed of dark fine clastic rock. The lithologic characters, sedimentary structures, probability cumulative grain size curves, grain-size parameters and C-M pattern of the sandstones of Bagong Formation in Dongqu outcrop profile all show as follows: the sandstones is generally fine and poorly sorted, the probability cumulative curve of the sandstones mostly represents one-stage, with a high percentage of the suspension and low percentage of the traction and saltation. In the C-M diagram, a line segment parallel to the C=M baseline is represented. The sedimentary structure of Paleodictyon trace fossils,which is flysch marks of deep sea—moderate sea, developed in Bagong Formation.Based on the comprehensive analysis, it is concluded that the Bagong Formation is a typical set of far-source fluxoturbidite in Dongqu area. Combined with the depositional characteristics of Bagong Formation in adjacent area, it is inferred that a palaeogeographic pattern of archipelago in Late Triassic developed in Qiangtang Basin.
引文
[1]中国地质调查局.中国地质调查新进展(2016)[R].北京:中国地质调查局,2016.
[2]谭富文,王剑,王小龙,等.羌塘盆地雁石坪地区中—晚侏罗世碳、氧同位素特征与沉积环境分析[J].地球学报,2004,25(2):119-126.
[3]王剑,丁俊,王成善,等.青藏高原油气资源战略选区调查与评价[M].北京:地质出版社,2009:164-422.
[4]王剑,谭富文,李亚林,等.青藏高原重点沉积盆地油气资源潜力分析[M].北京:地质出版社,2004:32-34.
[5]谭富文,张润合,王剑,等.羌塘晚三叠世—早白垩世裂陷盆地基底构造[J].成都理工大学学报(自然科学版),2016,43(5):513-521.
[6]李璞.西藏东部地质的初步认识[J].科学通报,1955(7):62-71,52.
[7]李忠,王道轩,林伟,等.库车坳陷中—新生界碎屑组分对物源类型及其构造属性的指示[J].岩石学报,2004,20(3):655-666.
[8]SEILACHER A. Trace fossil analysis[M]. Berlin:SpringerVerlag Berlin Heidelberg, 2007:156-158.
[9]张国成,王磊,吴贤涛.东濮凹陷图案型痕迹化石的发现及意义[J].河南理工大学学报(自然科学版),2013,32(6):691-696.
[10]王海方,胡斌,张关龙,等.东营凹陷古近系Paleodictyon遗迹化石的发现及意义[J].新疆石油地质,2005,26(4):404-407.
[11]DURDEN J M, SIMON-LLEDO E,GOODAY A J. Abundance and morphology of Paleodictyon nodosum, observed at the Clarion-Clipperton Zone[J]. Marine biodiversity, 2017, 47(2):265-269.
[12]LAN Z,CHEN Z Q. Paleodictyon from a nearshore paleoenvironmental setting in the Guadalupian(Middle Permian)of the Carnarvon Basin, Western Australia[J]. Australian journal of earth sciences, 2010, 57(4):453-467.
[13]RIAHI S, UCHMAN A, STOW D, et al. Deep-sea trace fossils of the Oligocene-Miocene Numidian Formation,northern Tunisia[J]. Palaeogeography,palaeoclimatology,palaeoecology,2014, 414:155-177.
[14]RONA P A,SEILACHER A,VARGAS C,et al. Paleodictyon nodosum:a living fossil on the deep-sea floor[J]. Deep-sea researchⅡ,2009,56:1700-1712.
[15]高抒.沉积物粒径趋势分析:原理与应用条件[J].沉积学报,2009,27(5):826-836.
[16]成都地质学院陕北队.沉积岩(物)粒度分析及其应用[M].北京:地质出版社,1978:66-80.
[17]冯娟萍,李文厚,欧阳征健.鄂尔多斯盆地黄陵地区上三叠统延长组长7、长6油层组浊积岩沉积特征及地质意义[J].古地理学报,2012,14(3):295-302.
[18]马晖,苑保国,吴国琼,等.霸县凹陷鄚州一高家堡地区沙三段滑塌浊积岩沉积特征及其成因探讨[J].油气地质与采收率,2010,17(2):51-53.
[19]赵宁,黄江琴,李栋明,等.远源缓坡型薄层细粒浊积岩沉积规律:以松南西斜坡大布苏地区青一段地层为例[J].沉积学报,2013,31(2):291-301.
[20]MOSCARDELLI L,WOOD L. New classification system for mass transport complexes in offshore Trinidad[J]. Basin research,2008,20(1):73-98.
[21]王剑,付修根.论羌塘盆地沉积演化[J].中国地质,2018,45(2):237-259.
[22]王剑,付修根,陈文西,等.藏北北羌塘盆地晚三叠世古风化壳地质地球化学特征及其意义[J].沉积学报,2007,25(4):487-494.
[23]王剑,付修根,谭富文,等.羌塘中生代(T3-K1)盆地演化新模式[J].沉积学报,2010,28(5):884-893.
[24]王剑,谭富文,付修根.羌塘盆地油气资源战略调查工程2017年度进展报告[R].成都:成都地质调查中心, 2017.
[25]占王忠,王东,谭富文.羌塘盆地玛曲地区石油地质条件研究及选区评价[R].成都:成都地质调查中心, 2018.
[26]方念乔.印尼多岛海沉积记录基本特征与云南古特提斯研究[J].地学前缘,2002,9(3):173-181.
[27]潘桂棠,王立全,李荣社,等.多岛弧盆系构造模式:认识大陆地质的关键[J].沉积与特提斯地质,2012,32(3):1-20.
[28]袁四化,王立全,江新胜,等.多岛海(洋)及多岛弧盆系造山模式解析造山带演化的研究进展[J].地质科技情报,2009,28(5):1-11.
[2]谭富文,王剑,王小龙,等.羌塘盆地雁石坪地区中—晚侏罗世碳、氧同位素特征与沉积环境分析[J].地球学报,2004,25(2):119-126.
[3]王剑,丁俊,王成善,等.青藏高原油气资源战略选区调查与评价[M].北京:地质出版社,2009:164-422.
[4]王剑,谭富文,李亚林,等.青藏高原重点沉积盆地油气资源潜力分析[M].北京:地质出版社,2004:32-34.
[5]谭富文,张润合,王剑,等.羌塘晚三叠世—早白垩世裂陷盆地基底构造[J].成都理工大学学报(自然科学版),2016,43(5):513-521.
[6]李璞.西藏东部地质的初步认识[J].科学通报,1955(7):62-71,52.
[7]李忠,王道轩,林伟,等.库车坳陷中—新生界碎屑组分对物源类型及其构造属性的指示[J].岩石学报,2004,20(3):655-666.
[8]SEILACHER A. Trace fossil analysis[M]. Berlin:SpringerVerlag Berlin Heidelberg, 2007:156-158.
[9]张国成,王磊,吴贤涛.东濮凹陷图案型痕迹化石的发现及意义[J].河南理工大学学报(自然科学版),2013,32(6):691-696.
[10]王海方,胡斌,张关龙,等.东营凹陷古近系Paleodictyon遗迹化石的发现及意义[J].新疆石油地质,2005,26(4):404-407.
[11]DURDEN J M, SIMON-LLEDO E,GOODAY A J. Abundance and morphology of Paleodictyon nodosum, observed at the Clarion-Clipperton Zone[J]. Marine biodiversity, 2017, 47(2):265-269.
[12]LAN Z,CHEN Z Q. Paleodictyon from a nearshore paleoenvironmental setting in the Guadalupian(Middle Permian)of the Carnarvon Basin, Western Australia[J]. Australian journal of earth sciences, 2010, 57(4):453-467.
[13]RIAHI S, UCHMAN A, STOW D, et al. Deep-sea trace fossils of the Oligocene-Miocene Numidian Formation,northern Tunisia[J]. Palaeogeography,palaeoclimatology,palaeoecology,2014, 414:155-177.
[14]RONA P A,SEILACHER A,VARGAS C,et al. Paleodictyon nodosum:a living fossil on the deep-sea floor[J]. Deep-sea researchⅡ,2009,56:1700-1712.
[15]高抒.沉积物粒径趋势分析:原理与应用条件[J].沉积学报,2009,27(5):826-836.
[16]成都地质学院陕北队.沉积岩(物)粒度分析及其应用[M].北京:地质出版社,1978:66-80.
[17]冯娟萍,李文厚,欧阳征健.鄂尔多斯盆地黄陵地区上三叠统延长组长7、长6油层组浊积岩沉积特征及地质意义[J].古地理学报,2012,14(3):295-302.
[18]马晖,苑保国,吴国琼,等.霸县凹陷鄚州一高家堡地区沙三段滑塌浊积岩沉积特征及其成因探讨[J].油气地质与采收率,2010,17(2):51-53.
[19]赵宁,黄江琴,李栋明,等.远源缓坡型薄层细粒浊积岩沉积规律:以松南西斜坡大布苏地区青一段地层为例[J].沉积学报,2013,31(2):291-301.
[20]MOSCARDELLI L,WOOD L. New classification system for mass transport complexes in offshore Trinidad[J]. Basin research,2008,20(1):73-98.
[21]王剑,付修根.论羌塘盆地沉积演化[J].中国地质,2018,45(2):237-259.
[22]王剑,付修根,陈文西,等.藏北北羌塘盆地晚三叠世古风化壳地质地球化学特征及其意义[J].沉积学报,2007,25(4):487-494.
[23]王剑,付修根,谭富文,等.羌塘中生代(T3-K1)盆地演化新模式[J].沉积学报,2010,28(5):884-893.
[24]王剑,谭富文,付修根.羌塘盆地油气资源战略调查工程2017年度进展报告[R].成都:成都地质调查中心, 2017.
[25]占王忠,王东,谭富文.羌塘盆地玛曲地区石油地质条件研究及选区评价[R].成都:成都地质调查中心, 2018.
[26]方念乔.印尼多岛海沉积记录基本特征与云南古特提斯研究[J].地学前缘,2002,9(3):173-181.
[27]潘桂棠,王立全,李荣社,等.多岛弧盆系构造模式:认识大陆地质的关键[J].沉积与特提斯地质,2012,32(3):1-20.
[28]袁四化,王立全,江新胜,等.多岛海(洋)及多岛弧盆系造山模式解析造山带演化的研究进展[J].地质科技情报,2009,28(5):1-11.