地球科学进展

地球科学进展 ›› 2018, Vol. 33 ›› Issue (6): 623 -640. doi: 10.11867/j.issn.1001-8166.2018.06.0623

研究论文 上一篇    下一篇

早志留世埃隆期上扬子海洋生物礁发育过程及制约机制——以渝南—黔北地区石牛栏组为例
王萍 1( ), 谭先锋 1, 2, *( ), 陈浩 3, 王佳 1, 梁迈 1, 罗龙 4, 冉天 1   
  1. 1.复杂油气田勘探开发重庆市重点实验室,重庆科技学院,重庆 401331
    2.中国地质调查局非常规油气地质重点实验室,北京 100029
    3.重庆市地勘局208水文地质工程地质队,重庆 400700
    4.中国石油大学(北京)地球科学学院,北京 102249
  • 收稿日期:2018-01-22 修回日期:2018-05-08 出版日期:2018-06-20
  • 通讯作者: 谭先锋 E-mail:1056118274@qq.com;xianfengtan8299@163.com
  • 基金资助:
    *中国地质调查局非常规油气地质重点实验室开放基金项目“中上扬子地区下古生界斑脱岩发育特征与页岩气形成富集的关系探索”(编号:DD20160181-YQ17W06JJ02);重庆科技学院研究生科技创新项目“上扬子地区早志留世生物礁的发育过程及油气地质意义”(编号: YKJCX1620136)资助.

The Development Process and Restriction Mechanism of Reefs (Aeronian,Early Silurian) in the Paleo-Ocean of Upper Yangtze Region—The Shiniulan Formation of Southern Chongqing and Northern Guizhou Province As An Example

Ping Wang 1( ), Xianfeng Tan 1, 2, *( ), Hao Chen 3, Jia Wang 1, Mai Liang 1, Long Luo 4, Tian Ran 1   

  1. 1.Chongqing Key Laboratory of Complex Oil and Gas Field Exploration and Development, Chongqing University of Science and Technology, Chongqing 401331, China
    2.The Key Laboratotry of Unconventional Petroleum Geology, China Geological Survey, Beijing 100029, China
    3.No.208 Hydrogeology and Engineering Geology Team of Chongqing Bureau of Geology and Minerals Exploration, Chongqing 400700, China
    4.China University of Petroleum (Beijing) College of Geosciences, Beijing 102249, China
  • Received:2018-01-22 Revised:2018-05-08 Online:2018-06-20 Published:2018-07-23
  • Contact: Xianfeng Tan E-mail:1056118274@qq.com;xianfengtan8299@163.com
  • About author:

    First author:Wang Ping(1993-), female,Zhaotong County, Yunnan Province, Master student. Research areas include paleoceanographic environment. E-mail:1056118274@qq.com

  • Supported by:
    Project supported by the Opening Fund of Key Laboratory of Unconventional Oil and Gas Geology, China Geological Survey “Development characteristics and its relation to the enrichment of shale gas exploration formation of Lower Paleozoic bentonites in middle and upper Yangtze Region”(No.DD20160181-YQ17W06JJ02);The Postgraduate Science and Technology Innovation Project of Chongqing University of Science and Technology “Early Silurian reef development process and its petroleum geological significance in the upper Yangtze area”(No.YKJCX1620136).
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上扬子海洋经历奥陶纪冰期之后,早志留世气温回暖,生物大量繁殖,上扬子地台石牛栏组(埃隆期)发育一定规模的珊瑚—层孔虫礁,生物礁为一些规模较小的点礁。在大量野外地质观察的基础上,综合利用镜下薄片鉴定、碳氧同位素及元素分析等方法,对早志留世上扬子海洋生物礁的发育过程进行系统研究。研究表明,该生物礁主要发育于石牛栏组中上段,造礁生物主要为珊瑚和层孔虫,附礁生物为苔藓虫、腕足类、头足类、藻类、海百合及双壳类等,主要发育于碳酸盐缓坡地带,经历了4个演化阶段,分别为定殖期、拓殖期、泛殖期和衰亡期,自下而上泥质及砂质含量逐渐减少,灰质成分和生物种类逐渐增多。在加里东构造运动的影响下,石牛栏组生物礁的生长频频受到外来物源搅动、海平面升降、海水温度及盐度的影响,这些因素共同制约着石牛栏组生物礁的生长特征、演化、延伸规模及大小。全球同期生物礁对比表明,早志留世埃隆期生物礁发育具有全球性,主要发育于气候温暖(20~28 ℃)的南北纬25°~30°碳酸盐台地边缘上,主要分布在劳伦古陆、西伯利亚古陆和哈萨克斯坦板块等地区,但与上扬子海洋早志留世生物礁在发育特征、演化、延伸规模及大小都有较大的差异。

关键词: 生物礁, 石牛栏组, 埃隆期, 早志留世, 上扬子古海洋

After the Ordovician Ice Age, the Paleo-Ocean of the Upper Yangtze Region had experienced temperature recovery in the Early Silurian and a large number of organisms multiplied. The scale of reefs was small patch reefs. A certain amount of coral-stromatoporoid reefs developed in the Shiniulan Formation (Late Aeronian, Early Silurian) in the Upper Yangtze Platform. Based on a lot of field geological observations and comprehensive use by means of thin section identification, carbon and oxygen isotopes and elemental analysis, we systematically studied the development process of reefs (Early Silurian) in the Paleo-Ocean of Upper Yangtze Region. The results showed that the coral-stromatoporoid reefs mainly developed in the middle-upper part of the stratum of the Shiniulan Formation. The reef-forming organisms were mainly coral and stromatoporoid, and reef-inserted organisms were bryozoans, brachiopods, cephalopods, algae, crinoids and bivalves. The Shiniulan Formation reef developed on the ramp of the carbonate Platform, which corresponded to the four growth stages of reefs: stabilization, colonization, diversification and domination. From the bottom to top, the Shiniulan Formation, the argillaceous and sandy content decreased, while the lime composition and biological remnants increased in quantity. Under the influence of Caledonian tectonic movement in the Early Silurian, the growth of reefs in the Shiniulan Formation of the Yangtze Platform was frequently affected by external source agitation, sea level fluctuation, seawater temperature and salinity. These factors restricted the growth characteristics, evolution, scale and size of reefs in the Shiniulan Formation. By comparing the synchronous global reef developmental state, we found that reefs were globally distributed in Aeronian, chiefly centering on the margin of carbonate platform at warm (20~28 ℃) and tropical latitudes 25~30° north and south. The reefs in the corresponding periods were dispersed in Laurentia, Siberia and Kazakhstan Block. However, there are great differences in the developmental characteristics, evolution and extension scale comparing with the reefs (Early Silurian) in the Paleo-Ocean of Upper Yangtze Region.

Key words: Reef, The Shiniulan Formation, Aeronian, Early Silurian, Paleo-Ocean of Upper Yangtze Region.

中图分类号: 

图1 区域地质背景及地层分布图
(a)志留纪年代地层表;(b)上扬子海洋早志留世埃隆晚期古地理格局 [ 17 , 24 ];(c) 石牛栏组岩性柱状图(重庆万盛机枪台剖面)
Fig.1 Regional geological background and stratigraphic distribution
(a) Chronostratigraphic table of the Silurian; (b) Paleogeographic pattern of the Late Aeronian (Early Silurian) in the Paleo-Ocean of Upper Yangtze Region [ 17 , 24 ]; (c) The Shiniulan Formation lithology (the Jiqiangtai section of Wansheng, Chongqing)
图1 区域地质背景及地层分布图
(a)志留纪年代地层表;(b)上扬子海洋早志留世埃隆晚期古地理格局 [ 17 , 24 ];(c) 石牛栏组岩性柱状图(重庆万盛机枪台剖面)
Fig.1 Regional geological background and stratigraphic distribution
(a) Chronostratigraphic table of the Silurian; (b) Paleogeographic pattern of the Late Aeronian (Early Silurian) in the Paleo-Ocean of Upper Yangtze Region [ 17 , 24 ]; (c) The Shiniulan Formation lithology (the Jiqiangtai section of Wansheng, Chongqing)
图2 上扬子地区石牛栏组地层对比图
Fig.2 Coenocorrelation of the Shiniulan Formation in the Upper Yangtze Region
① Fig.3 a~h; ② Fig.4 a~f;③ Fig.7 a,b; ④ Fig.7 c; ⑤ Fig. 7 d
图2 上扬子地区石牛栏组地层对比图
Fig.2 Coenocorrelation of the Shiniulan Formation in the Upper Yangtze Region
① Fig.3 a~h; ② Fig.4 a~f;③ Fig.7 a,b; ④ Fig.7 c; ⑤ Fig. 7 d
图3 上扬子地区石牛栏组生物礁灰岩特征
(a)珊瑚格架体呈近圆形凸起,能与周围岩石很好区分开,机枪台剖面,106 m;(b) 大量造礁生物珊瑚出现于生物礁灰岩中,机枪台剖面,98 m;(c),(d)石牛栏古巢珊瑚属( Palaeofavosites shiniulanensis)属于蜂巢珊瑚目(Favositida)古巢珊瑚属( Palaeofavosites)。个体呈扩散状排列,个体横切面多角形,大小不一致,大者6~8边形,在大个体周围排列小个体;横板完整呈水平状,少数呈倾斜。(e)拉贝希层孔虫(未定种)( Labechia sp.)共骨为块状。骨骼由连续的平缓的波状细层和短支柱组成。局部泡沫板支柱主要由细层向下弯折而成, 未达底层。支柱的横断面为圆形;(f) 大量的生物碎屑如珊瑚、藻类及苔藓虫在生物礁灰岩,机枪台剖面,100 m;(g) 点礁内部含大量珊瑚、层孔虫和藻类等生物,机枪台剖面,105 m;(h) 生物礁横向上厚约5 m,长约27 m,机枪台剖面
Fig.3 Biohermal limestone characteristics of the Shiniulan Formation in the Upper Yangtze Region
(a) Coral frame is suborbicular convex and can be visually discriminated from the surrounding rock in the Jiqiangtai section,106 m; (b) Corals coexist in biohermal limestone in the Jiqiangtai section, 98 m.(c),(d) The individual of Palaeofavosites shiniulanensis is arranged in a diffuse arrangement. The individual transverse section is polygonal, the large 6~8 sides in shaped, and the small individuals are arranged around the large individuals. The tabula are completely horizontal and a few are tilted. (e) Skeleton of Labechia sp. is massive and consists of gentle wavy lamina and short backbones. The local cystose pillars are mainly bent down from a thin layer and not reach the bottom layer. (f) A large number of biodetritus such as stromatoporoids, tabulate corals, algae and bryozoans in biohermal limestone of the Jiqiangtai section, 100 m; (g) Patch reefs. It contains a lot of corals, stromatoporoids and algae in the Jiqiangtai section, 105 m. (h) the layered reefs extend laterally by 27 m and 5 m in thickness of the upper part in the Shiniulan Formation of the Jiqiangtai section
图3 上扬子地区石牛栏组生物礁灰岩特征
(a)珊瑚格架体呈近圆形凸起,能与周围岩石很好区分开,机枪台剖面,106 m;(b) 大量造礁生物珊瑚出现于生物礁灰岩中,机枪台剖面,98 m;(c),(d)石牛栏古巢珊瑚属( Palaeofavosites shiniulanensis)属于蜂巢珊瑚目(Favositida)古巢珊瑚属( Palaeofavosites)。个体呈扩散状排列,个体横切面多角形,大小不一致,大者6~8边形,在大个体周围排列小个体;横板完整呈水平状,少数呈倾斜。(e)拉贝希层孔虫(未定种)( Labechia sp.)共骨为块状。骨骼由连续的平缓的波状细层和短支柱组成。局部泡沫板支柱主要由细层向下弯折而成, 未达底层。支柱的横断面为圆形;(f) 大量的生物碎屑如珊瑚、藻类及苔藓虫在生物礁灰岩,机枪台剖面,100 m;(g) 点礁内部含大量珊瑚、层孔虫和藻类等生物,机枪台剖面,105 m;(h) 生物礁横向上厚约5 m,长约27 m,机枪台剖面
Fig.3 Biohermal limestone characteristics of the Shiniulan Formation in the Upper Yangtze Region
(a) Coral frame is suborbicular convex and can be visually discriminated from the surrounding rock in the Jiqiangtai section,106 m; (b) Corals coexist in biohermal limestone in the Jiqiangtai section, 98 m.(c),(d) The individual of Palaeofavosites shiniulanensis is arranged in a diffuse arrangement. The individual transverse section is polygonal, the large 6~8 sides in shaped, and the small individuals are arranged around the large individuals. The tabula are completely horizontal and a few are tilted. (e) Skeleton of Labechia sp. is massive and consists of gentle wavy lamina and short backbones. The local cystose pillars are mainly bent down from a thin layer and not reach the bottom layer. (f) A large number of biodetritus such as stromatoporoids, tabulate corals, algae and bryozoans in biohermal limestone of the Jiqiangtai section, 100 m; (g) Patch reefs. It contains a lot of corals, stromatoporoids and algae in the Jiqiangtai section, 105 m. (h) the layered reefs extend laterally by 27 m and 5 m in thickness of the upper part in the Shiniulan Formation of the Jiqiangtai section
图4 上扬子地区生物礁微观镜下特征
(a) 四射珊瑚(扭心珊瑚Str)单体分布于生物岩体空间中,隔壁清晰,呈近圆状,内被方解石充填,第三段,机枪台剖面;(b) 造礁生物的蜂巢珊瑚的复体横向上由不规则的六边形组成,纵向上呈放射状,第四段,机枪台剖面;(c),(d) 造礁生物层孔虫(L-St)呈零散呈上凹板状、扩展状及层状出现于生物礁岩层中,第四段,机枪台剖面;(e) 藻类(AL)在生物礁岩层中,周围含深色黄铁矿(Py),第四段,机枪台剖面;(f) 双壳动物(Bi)碎屑被方解石(C)碎屑包裹,第三段,机枪台剖面
Fig.4 Microscopic photographs of reefs in the Upper Yangtze Region
(a) Rugose coral (Streptelasma) distribute in the biological limestone is suborbicular by full of calcite, and the septum is clear, in the third stratum ofbthe Shiniulan Formation of the Jiqiangtai section; (b) Favosites complex in the third stratum of the Shiniulan Formation of Jiqiangtai section as reef-building organisms present irregular hexagonal structure vertically; (c),(d) Stromatoporoids forming scattered-tabular, domal-tabular, tractile, and bedded structures in biohermal limestone in the fourth stratum of the Shiniulan Formation of Jiqiangtai section; (e) Calcareous alga in biohermal limestone is surrounded by pyrite in the fourth stratum of the Shiniulan Formation of Jiqiangtai section; (f) Fragments of bivalves is surrounded by calcite (limestone) in the third stratum of the Shiniulan Formation of Jiqiangtai section
图4 上扬子地区生物礁微观镜下特征
(a) 四射珊瑚(扭心珊瑚Str)单体分布于生物岩体空间中,隔壁清晰,呈近圆状,内被方解石充填,第三段,机枪台剖面;(b) 造礁生物的蜂巢珊瑚的复体横向上由不规则的六边形组成,纵向上呈放射状,第四段,机枪台剖面;(c),(d) 造礁生物层孔虫(L-St)呈零散呈上凹板状、扩展状及层状出现于生物礁岩层中,第四段,机枪台剖面;(e) 藻类(AL)在生物礁岩层中,周围含深色黄铁矿(Py),第四段,机枪台剖面;(f) 双壳动物(Bi)碎屑被方解石(C)碎屑包裹,第三段,机枪台剖面
Fig.4 Microscopic photographs of reefs in the Upper Yangtze Region
(a) Rugose coral (Streptelasma) distribute in the biological limestone is suborbicular by full of calcite, and the septum is clear, in the third stratum ofbthe Shiniulan Formation of the Jiqiangtai section; (b) Favosites complex in the third stratum of the Shiniulan Formation of Jiqiangtai section as reef-building organisms present irregular hexagonal structure vertically; (c),(d) Stromatoporoids forming scattered-tabular, domal-tabular, tractile, and bedded structures in biohermal limestone in the fourth stratum of the Shiniulan Formation of Jiqiangtai section; (e) Calcareous alga in biohermal limestone is surrounded by pyrite in the fourth stratum of the Shiniulan Formation of Jiqiangtai section; (f) Fragments of bivalves is surrounded by calcite (limestone) in the third stratum of the Shiniulan Formation of Jiqiangtai section
图5 上扬子海洋早志留世生物礁发育过程模式图
(a) 习水羊九剖面岩性柱状图;(b)石牛栏组生物礁发育模式图
Fig.5 The developmental pattern of reef (Early Silurian) in Paleo-Ocean of Upper Yangtze Region
(a) Lithologic column in the Yangjiu section of Xishui County, Guizhou; (b) Development pattern of reef in the Shiniulan Formation
图5 上扬子海洋早志留世生物礁发育过程模式图
(a) 习水羊九剖面岩性柱状图;(b)石牛栏组生物礁发育模式图
Fig.5 The developmental pattern of reef (Early Silurian) in Paleo-Ocean of Upper Yangtze Region
(a) Lithologic column in the Yangjiu section of Xishui County, Guizhou; (b) Development pattern of reef in the Shiniulan Formation
图6 上扬子海洋早志留世海平面变化与生物礁发育过程
(a) 代表性地层岩性剖面—贵州习水羊九石牛栏组;(b) 石牛栏组生物礁生长示意模型及相关的岩相;(c)生物礁生长对应海平面的相对变化
Fig.6 Sea level changes and developmental stage of reef (Early Silurian) in Paleo-Ocean of Upper Yangtze Region
(a) Representative lithology profile in the Yangjiu section of Xishui County, Guizhou; (b) Development pattern of reef and related lithofacies in the Shiniulan Formation; (c) The relative change of reef growth corresponding to sea level
图6 上扬子海洋早志留世海平面变化与生物礁发育过程
(a) 代表性地层岩性剖面—贵州习水羊九石牛栏组;(b) 石牛栏组生物礁生长示意模型及相关的岩相;(c)生物礁生长对应海平面的相对变化
Fig.6 Sea level changes and developmental stage of reef (Early Silurian) in Paleo-Ocean of Upper Yangtze Region
(a) Representative lithology profile in the Yangjiu section of Xishui County, Guizhou; (b) Development pattern of reef and related lithofacies in the Shiniulan Formation; (c) The relative change of reef growth corresponding to sea level
表1 羊九村骑龙剖面碳、氧同位素分析
Table 1 Analyzing of carbon and oxygen isotope in Qilong Section
序号 原送
样号		 δ13C PDB /‰ δ18O PDB/‰ δ18O
校正值		 Z/‰ T/℃ 序号 原送
样号		 δ13C PDB /‰ δ18O PDB /‰ δ18O校正值 Z/‰ T/℃
1 QL-1 1.47 -9.81 -1.46 125.43 23.65 27 QL-28 2.57 -9.61 -1.26 127.78 22.73
2 QL-2 1.71 -9.85 -1.5 125.90 23.83 28 QL-29 2.38 -9.28 -0.93 127.55 21.22
3 QL-3 1.90 -9.49 -1.14 126.47 22.18 29 QL-30 2.35 -9.46 -1.11 127.40 22.04
4 QL-4 1.57 -9.52 -1.17 125.77 22.32 30 QL-31 1.90 -9.86 -1.51 126.28 23.88
5 QL-5 1.50 -9.62 -1.27 125.58 22.77 31 QL-32 2.29 -9.46 -1.11 127.28 22.04
6 QL-6 1.69 -9.52 -1.17 126.02 22.32 32 QL-33 2.3 -9.48 -1.13 127.29 22.13
7 QL-7 1.98 -9.61 -1.26 126.57 22.73 33 QL-34 2.35 -9.26 -0.91 127.50 21.13
8 QL-8 1.93 -9.65 -1.30 126.45 22.91 34 QL-35 2.32 -9.34 -0.99 127.40 21.49
9 QL-9 1.88 -9.70 -1.35 126.32 23.14 35 QL-36 2.2 -9.25 -0.9 127.20 21.08
10 QL-10 2.15 -9.38 -1.03 127.03 21.68 36 QL-37 2.16 -9.16 -0.81 127.16 20.67
11 QL-11 2.19 -9.47 -1.12 127.07 22.09 37 QL-38 2.13 -9.03 -0.68 127.17 20.08
12 QL-12 1.97 -9.69 -1.34 126.51 23.09 38 QL-39 2.14 -9.01 -0.66 127.20 19.99
13 QL-13 2.25 -9.47 -1.12 127.19 22.09 39 QL-40 1.68 -9.43 -1.08 126.04 21.90
14 QL-14 2.19 -9.64 -1.29 126.98 22.87 40 QL-41 1.90 -8.70 -0.35 126.86 18.58
15 QL-15 1.45 -9.35 -1.00 125.61 21.54 41 QL-42 1.83 -8.94 -0.59 126.60 19.67
16 QL-16 1.91 -9.71 -1.36 126.38 23.19 42 QL-43 1.23 -8.97 -0.62 125.35 19.81
17 QL-17 1.80 -9.46 -1.11 126.28 22.04 43 QL-44 0.52 -9.21 -0.86 123.78 20.90
18 QL-18 1.67 -9.43 -1.08 126.02 21.90 44 QL-45 0.69 -9.41 -1.06 124.03 21.81
19 QL-19 1.70 -9.56 -1.21 126.02 22.50 45 QL-46 0.85 -9.42 -1.07 124.35 21.86
20 QL-21 -0.31 -9.27 -0.92 122.05 21.17 46 QL-47 1.12 -10.14 -1.79 124.54 25.16
21 QL-22 1.87 -9.53 -1.18 126.38 22.36 47 QL-48 1.01 -9.96 -1.61 124.41 24.34
22 QL-23 2.29 -9.61 -1.26 127.20 22.73 48 QL-49 1.29 -9.48 -1.13 125.22 22.13
23 QL-24 2.25 -9.39 -1.04 127.23 21.72 49 QL-50 2.81 -11.09 -2.74 127.53 29.58
24 QL-25 2.26 -9.31 -0.96 127.29 21.36 50 QL-51 2.15 -10.63 -2.28 126.41 27.43
25 QL-26 2.12 -9.82 -1.47 126.75 23.69 51 QL-52 1.63 -10.99 -2.64 125.17 29.11
26 QL-27 2.63 -9.62 -1.27 127.90 22.77
表1 羊九村骑龙剖面碳、氧同位素分析
Table 1 Analyzing of carbon and oxygen isotope in Qilong Section
序号 原送
样号		 δ13C PDB /‰ δ18O PDB/‰ δ18O
校正值		 Z/‰ T/℃ 序号 原送
样号		 δ13C PDB /‰ δ18O PDB /‰ δ18O校正值 Z/‰ T/℃
1 QL-1 1.47 -9.81 -1.46 125.43 23.65 27 QL-28 2.57 -9.61 -1.26 127.78 22.73
2 QL-2 1.71 -9.85 -1.5 125.90 23.83 28 QL-29 2.38 -9.28 -0.93 127.55 21.22
3 QL-3 1.90 -9.49 -1.14 126.47 22.18 29 QL-30 2.35 -9.46 -1.11 127.40 22.04
4 QL-4 1.57 -9.52 -1.17 125.77 22.32 30 QL-31 1.90 -9.86 -1.51 126.28 23.88
5 QL-5 1.50 -9.62 -1.27 125.58 22.77 31 QL-32 2.29 -9.46 -1.11 127.28 22.04
6 QL-6 1.69 -9.52 -1.17 126.02 22.32 32 QL-33 2.3 -9.48 -1.13 127.29 22.13
7 QL-7 1.98 -9.61 -1.26 126.57 22.73 33 QL-34 2.35 -9.26 -0.91 127.50 21.13
8 QL-8 1.93 -9.65 -1.30 126.45 22.91 34 QL-35 2.32 -9.34 -0.99 127.40 21.49
9 QL-9 1.88 -9.70 -1.35 126.32 23.14 35 QL-36 2.2 -9.25 -0.9 127.20 21.08
10 QL-10 2.15 -9.38 -1.03 127.03 21.68 36 QL-37 2.16 -9.16 -0.81 127.16 20.67
11 QL-11 2.19 -9.47 -1.12 127.07 22.09 37 QL-38 2.13 -9.03 -0.68 127.17 20.08
12 QL-12 1.97 -9.69 -1.34 126.51 23.09 38 QL-39 2.14 -9.01 -0.66 127.20 19.99
13 QL-13 2.25 -9.47 -1.12 127.19 22.09 39 QL-40 1.68 -9.43 -1.08 126.04 21.90
14 QL-14 2.19 -9.64 -1.29 126.98 22.87 40 QL-41 1.90 -8.70 -0.35 126.86 18.58
15 QL-15 1.45 -9.35 -1.00 125.61 21.54 41 QL-42 1.83 -8.94 -0.59 126.60 19.67
16 QL-16 1.91 -9.71 -1.36 126.38 23.19 42 QL-43 1.23 -8.97 -0.62 125.35 19.81
17 QL-17 1.80 -9.46 -1.11 126.28 22.04 43 QL-44 0.52 -9.21 -0.86 123.78 20.90
18 QL-18 1.67 -9.43 -1.08 126.02 21.90 44 QL-45 0.69 -9.41 -1.06 124.03 21.81
19 QL-19 1.70 -9.56 -1.21 126.02 22.50 45 QL-46 0.85 -9.42 -1.07 124.35 21.86
20 QL-21 -0.31 -9.27 -0.92 122.05 21.17 46 QL-47 1.12 -10.14 -1.79 124.54 25.16
21 QL-22 1.87 -9.53 -1.18 126.38 22.36 47 QL-48 1.01 -9.96 -1.61 124.41 24.34
22 QL-23 2.29 -9.61 -1.26 127.20 22.73 48 QL-49 1.29 -9.48 -1.13 125.22 22.13
23 QL-24 2.25 -9.39 -1.04 127.23 21.72 49 QL-50 2.81 -11.09 -2.74 127.53 29.58
24 QL-25 2.26 -9.31 -0.96 127.29 21.36 50 QL-51 2.15 -10.63 -2.28 126.41 27.43
25 QL-26 2.12 -9.82 -1.47 126.75 23.69 51 QL-52 1.63 -10.99 -2.64 125.17 29.11
26 QL-27 2.63 -9.62 -1.27 127.90 22.77
图7 外来物源搅动影响下的沉积岩体
(a) 生物灰岩中含有大量石英颗粒(Q),机枪台剖面,129.6 m;(b) 大量石英颗粒于生物格架中,机枪台剖面,102 m;(c) 颗粒灰岩中含有大量石英颗粒(Q)和方解石颗粒(C),机枪台剖面,88 m;(d) 泥质条带频繁出现于石牛栏组地层中,机枪台剖面,138 m
Fig.7 The sedimentary rock under the influence of external sources agitation
(a)The biohermal of the Jiqiangtai section contains a large number of quartz particles (Q), 129.6 m; (b) A large number of quartz particles scattered in the organic framework of the Jiqiangtai section, 102 m; (c) Grainstone contains a large number of quartz particles (Q) and calcite particles (C) in the Jiqiangtai section, 88 m; (d) The pelitic stripe occur frequently in the Jiqiangtai section, 138 m
图7 外来物源搅动影响下的沉积岩体
(a) 生物灰岩中含有大量石英颗粒(Q),机枪台剖面,129.6 m;(b) 大量石英颗粒于生物格架中,机枪台剖面,102 m;(c) 颗粒灰岩中含有大量石英颗粒(Q)和方解石颗粒(C),机枪台剖面,88 m;(d) 泥质条带频繁出现于石牛栏组地层中,机枪台剖面,138 m
Fig.7 The sedimentary rock under the influence of external sources agitation
(a)The biohermal of the Jiqiangtai section contains a large number of quartz particles (Q), 129.6 m; (b) A large number of quartz particles scattered in the organic framework of the Jiqiangtai section, 102 m; (c) Grainstone contains a large number of quartz particles (Q) and calcite particles (C) in the Jiqiangtai section, 88 m; (d) The pelitic stripe occur frequently in the Jiqiangtai section, 138 m
图8 加拿大Menier组与上扬子地区石牛栏组生物礁对比 [ 4 ]
Fig.8 Comparison of the Menier Formation and the Shiniulan Formation in the Upper Yangtze Region [ 4 ]
图8 加拿大Menier组与上扬子地区石牛栏组生物礁对比 [ 4 ]
Fig.8 Comparison of the Menier Formation and the Shiniulan Formation in the Upper Yangtze Region [ 4 ]
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