下扬子南京地区早寒武世幕府山组海平面相对升降的地球化学和碳、氧同位素记录

doi:10.13278/j.cnki.jjuese.20190035

摘要/Abstract

摘要： 本文对南京地区早寒武世幕府山组沉积环境及地球化学特征进行了研究，利用元素地球化学和碳、氧同位素特征对古盐度、古水深及古环境的记录，分析幕府山组时期发生的海平面相对升降。结果表明：下扬子南京地区下寒武统幕府山组Mg²⁺/Ca²⁺值与古水深呈负相关，Sr/Ba值、1000Sr/Ca值和V/Ni值与古盐度、古水深呈正相关，Sr/Ba值、1000Sr/Ca值和V/Ni值反映的古盐度、古水深曲线可以指示海平面相对升降。幕府山组样品碳、氧同位素保留了原始海洋的同位素组成：δ¹³C_PDB值分布于0.8‰~3.5‰之间，均值为2.55‰；δ¹⁸O_PDB值分布于-6.9‰~-2.2‰之间，均值为-4.18‰。幕府山组样品的δ¹³C_PDB值大小可以反映海平面的相对升降，两者呈正相关。根据Sr/Ba值、1000Sr/Ca值、V/Ni值、δ¹³C_PDB值和沉积环境演化，绘制了幕府山组海平面相对升降曲线。幕府山组经历了一次海侵-海退旋回，海平面相对升降曲线反映了幕府山组海平面波动频繁，由3次海平面相对上升和3次海平面相对下降组成。

关键词: 下扬子南京地区, 下寒武统, 幕府山组, 地球化学, 碳、氧同位素, 海平面变化

Abstract: This research is to study the sedimentary environment and geochemical characteristics of the Early Cambrian Mufushan Formation in Nanjing area. The relative sea level rise and fall of the Mufushan Formation is analyzed by using element geochemistry, isotopic characteristics of carbon and oxygen, records of paleo-salinity, paleo-water depth, and paleo-environment. The Mg²⁺/Ca²⁺ values of the Mufushan Formation has a negative correlation with the paleo-bathymetry. The values of Sr/Ba, 1000Sr/Ca and V/Ni show positive correlation with the paleo-salinity and paleo-water depth. The curves of paleo-salinity and paleo-water depth reflected by the values of Sr/Ba, 1000Sr/Ca and V/Ni indicate the cyclicity of the sea-level changes. The oxygen and carbon isotopes of the Mufushan Formation samples retain the original marine isotope composition. The δ¹³C_PDB values distribute between 0.8‰ and 3.5‰,with the mean of 2.55‰. The δ¹⁸O_PDB values distribute between -6.9‰ and -2.2‰,with the mean of -4.18‰. The δ¹³C_PDB values of the Mufushan Formation samples reflect the relative sea-level lift. Based on the values of Sr/Ba, 1000Sr/Ca, V/Ni,δ¹³C_PDB and the evolution of the sedimentary environment, the curves of relative sea-level lift of the Mufushan Formation are drawn. The Mufushan Formation underwent a transgressive-regressive cycle. The relative sea-level lift curve shows that the sea-level fluctuated frequently in the Mufushan period. The fluctuation is composed by three relative sea-level rises and three declines.

Key words: Nanjing in lower Yangtze region, Early Cambrian, Mufushan Formation, geochemistry, oxygen and carbon isotope, sea-level changes

中图分类号:

许中杰, 孔锦涛, 程日辉, 李双林, 孔媛, 于振峰. 下扬子南京地区早寒武世幕府山组海平面相对升降的地球化学和碳、氧同位素记录[J]. 吉林大学学报(地球科学版), 2020, 50(1): 158-169.

Xu Zhongjie, Kong Jintao, Cheng Rihui, Li Shuanglin, Kong Yuan, Yu Zhenfeng. Geochemical and Carbon and Oxygen Isotope Records of Relative Sea-Level Change of Mufushan Formation in Early Cambrian in Nanjing, Lower Yangtze Region[J]. Journal of Jilin University(Earth Science Edition), 2020, 50(1): 158-169.

参考文献

[1] 陈安定. 苏北南部、句容地区中、古生界构造特征[J]. 小型油气藏,2006,11(1):1-13. Chen Anding. Structural Feature of Mesozoic,Paleozoic in Jurong Area,South Subei[J]. Small Hydro Carbon Reservoirs,2006,11(1):1-13.
[2] 周浩达.下扬子区早寒武世"石煤"沉积特征与成因机理探讨:兼论与含油气性关系[J]. 石油实验地质,1990,12(1):36-43. Zhou Haoda. On the Mechanism and the Characteristics of Early Cambrian "Stone Coal" in Lower Yangtze Region and Their Relation to Petroliferous Potentials[J]. Experimental Petroleum Geology,1990,12(1):36-43.
[3] 李林,汤庚国,许晓岗.南京幕府山植物区系研究[J].南京林业大学学报(自然科学版),2006,30(2):38-42. Li Lin,Tang Gengguo,Xu Xiaogang. Studies on Flora of Mountain Mufu Nanjing[J]. Journal of Nanjing Forestry University(Natural Sciences Edition),2006,30(2):38-42.
[4] 王军,李卓然,徐丽,等.南京市幕府山群落物种多样性的初步研究[J]. 南京大学学报(自然科学版),2010,46(2):229-235. Wang Jun,Li Zhuoran,Xu Li,et al. Preliminary Study on the Communities and Species Diversity of the Mufu Mountain Nanjing[J] Journal of Nanjing University(Natural Sciences),2010,46(2):229-235.
[5] 刘小平,潘继平,刘东鹰,等.苏北地区下寒武统幕府山组页岩气勘探前景[J]. 成都理工大学学报(自然科学版),2012,39(2):198-205. Liu Xiaoping,Pan Jiping,Liu Dongying,et al. Shale-Gas Exploration Prospect of Lower Cambrian Mufushan Formation in the Northern Jiangsu China[J]. Journal of Chengdu University of Technology(Science & Technology Edition),2012,39(2):198-205.
[6] 蔡来星,肖国林,郭兴伟,等. 由下扬子区海陆对比分析南黄海盆地下志留统烃源岩特征及其主控因素[J]. 吉林大学学报(地球科学版), 2019, 49(1):39-52. Cai Laixing,Xiao Guolin,Guo Xingwei,et al. Characteristics of Lower Silurian Hydrocarbon Source Rocks and Their Main Controlling Factors in the South Yellow Sea Basin Based on Land-Ocean Comparison in the Lower Yangtze Region[J]. Journal of Jilin University (Earth Science Edition),2019,49(1):39-52.
[7] 陈文彬,谭富文,伊海生,等.羌塘盆地那底岗日地区布曲组碳酸盐岩烃源岩稀土元素分布特征及意义[J]. 沉积学报,2011,29(3):529-536. Chen Wenbin,Tan Fuwen,Yi Haisheng,et al. REE Characteristics and Its Geological Significance of Buqu Formation Carbonate Source Rocks in Nadigangri Area,Qiangtang Basin of Tibet[J]. Acta Sedimentologica Sinica,2011,29(3):529-536.
[8] 高长林,叶德燎,方成名.下扬子早古生代碳酸盐岩的稀土元素特征及其意义[J]. 油气藏评价与开发,2011,1(1/2):1-6. Gao Changlin,Ye Deliao,Fang Chengming. Characteristics and Significance of Carbonate Rocks REE During Early Palaeozoic in Lower Yangtze Region[J]. Reservoir Evaluation and Development,2011,1(1/2):1-6.
[9] Pufahl P K,James N P,Kyser T K,et al. Brachiopods in Epeiric Seas as Monitors of Secular Changes in Ocean Chemistry:Amiocene Example from the Murray Basin, South Australia[J]. Journal of Sedimentary Research,2006,76(6):926-941.
[10] Payne J L,Kump L R. Evidence for Recurrent Early Triassic Massive Volcanism from Quantitative in Terpretation of Carbon Isotope Fluctuations[J]. Earth and Planetary Science Letters,2007,256(1/2):264-277.
[11] 牛君,黄文辉,丁文龙,等. 麦盖提斜坡奥陶系碳酸盐岩碳氧同位素特征及其意义[J]. 吉林大学学报(地球科学版),2017,47(1):61-73. Niu Jun,Huang Wenhui,Ding Wenlong,et al. Carbon and Oxygen Isotope Caharacteristics and Its Significance of Ordovician Carbonates in Yubei Area of Maigaiti Slope[J]. Journal of Jilin University (Earth Science Edition),2017,,47(1):61-73.
[12] 罗顺社,汪凯明.河北宽城地区中元古代高于庄组碳酸盐岩碳氧同位素特征[J]. 地质学报,2010,84(4):492-499. Luo Shunshe,Wang Kaiming. Carbon and Oxygen Isotope Composition of Carbonatic Rock from the Mesoproterozoic Gaoyuzhuang Formation in the Kuancheng Area,Hebei Province[J]. Acta Geologica Sinica,,2010,84(4):492-499.
[13] 郭念发,赵红格,陈红,等. 下扬子地区海相地层油气赋存条件分析及选区评价[J].西北大学学报(自然科学版),2002,32(5):526-530. Guo Nianfa,Zhao Hongge,Chen Hong,et al. Oil-Gas Occurrence Conditions and Evaluation of Chosen Belts of the Marine Strata in Lower Yangtze Area[J]. Journal of Northwest University (Natural Science Edition),2002,32(5):526-530.
[14] 许中杰,程日辉,王嘹亮,等. 广东东莞地区中侏罗统塘厦组凝灰质沉积物的元素地球化学特征及构造背景[J].岩石学报,2010,26(1):352-360. Xu Zhongjie,Cheng Rihui,Wang Liaoliang,et al. Elemental Geochemical Characteristics of Tuffaceous Sediments and Tectonic Setting of Tangxia Formation of Middle Jurassic in Dongguan, Guangdong Province[J]. Acta Petrologica Sinica,2010,26(1):352-360.
[15] 陈强,张慧元,李文厚,等.鄂尔多斯奥陶系碳酸盐岩碳氧同位素特征及其意义[J].古地理学报,2012,14(1):117-124. Chen Qiang,Zhang Huiyuan,Li Wenhou,et al. Characteristics of Carbon and Oxygen Isotopes of the Ordovician Carbonate Rocks in Ordos and Their Implication[J]. Journal of Palaeogeography,2012,14(1):117-124.
[16] 许中杰,程日辉,张莉,等.华南陆缘晚三叠-早、中侏罗世海平面相对升降与古气候演化的地球化学记录[J]. 地球科学:中国地质大学学报,2012,37(1):113-124. Xu Zhongjie,Cheng Rihui,Zhang Li,et al. The Geochemistry Records of Sea-Level Relative Movement and Paleoclimatic Evolution of the South China Continental Margin in Late Triassic-Early-Middle Jurassic[J].Earth Science:Journal of China University of Geosciences,2012,37(1):113-124.
[17] 旷红伟,刘燕学,孟祥化,等.吉辽地区震旦系碳酸盐岩地球化学特征及其环境意义[J]. 天然气地球科学,2005,16(1):54-58. Kuang Hongwei,Liu Yanxue,Meng Xianghua,et al. The Geochemical Features and Its Environmental Significance of the Sinian Carbonates in the Jilin-Liaoning Area[J]. Natural Gas Geoscience,2005,16(1):54-58.
[18] Veizer J,Demovic R. Strontium as a Tool for Facies Analysis[J]. Journal of Sedimentary Petrology,1974,44(1):93-115.
[19] 韩永林,王海红,陈志华,等.耿湾-史家湾地区长6段微量元素地球化学特征及古盐度分析[J]. 岩性油气藏,2007,19(4):16-20. Han Yonglin,Wang Haihong,Chen Zhihua,et al. Paleosalinity Analysis and Trace Element Geochemistry of Chang 6 Member in Gengwan-Shijiawan Area, Ordos Basin[J]. Lithologic Reservoirs,2007,19(4):16-20.
[20] 邵龙义.湘中早石炭世沉积学和层序地层学[M]. 北京:中国矿业大学出版社,1997:79-87. Shao Longyi. Sedimentology and Sequence Stratigraphy in Early Carboniferous in Middle Hunan[M]. Beijing:China Mining University Press,1997:79-87.
[21] 牟保磊.元素地球化学[M].北京:北京大学出版社,1999:27-171. Mou Baolei. Element Geochemistry[M]. Beijing:Peking University Press,1999:27-171.
[22] 李祥辉,张洁.海平面及海平面变化综述[J].岩相古地理,1999,19(4):61-72. Li Xianghui,Zhang Jie. Review of Sea-Level and Sea Level Change[J].Sedimentary Facies and Palaeogeography,1999,19(4):61-72.
[23] 汪凯明,罗顺社.海相碳酸盐岩锶同位素及微量元素特征与海平面变化[J]. 海洋地质与第四纪地质,2009,29(6):51-58. Wang Kaiming,Luo Shunshe. Strontium Isotope and Trace Element Characteristics of Marine Carbonate and Sea Level Fluctuation[J]. Marine Geology & Quaternary Geology,2009,29(6):51-58.
[24] Derry L A,Brasier M D,Corfield R M,et al. Sr and C Isotopes in Lower Cambrian Carbonates from the Siberian Craton:A Paleoenvironmental Record During the Cambrian Explosion[J]. Earth and Planetary Science Letters,1994,128(3/4):671-681.
[25] Kaufman A J,Knoll A H. Neoproterozoic Variations in the C-Isotopic Composition of Seawater:Stratigraphic and Biogeochemical Implications[J]. Precambrian Research,1995,73(1/2/3/4):27-49.
[26] 王大锐,冯晓杰.渤海湾地区下古生界碳、氧同位素地球化学研究[J]. 地质学报,2002,76(3):400-408. Wang Darui,Feng Xiaojie. Research on Carbon and Oxygen Geochemistry of Lower Paleozoic in North China[J]. Acta Geologica Sinica,2002,76(3):400-408.
[27] 王大锐,白志强. 广西中-上泥盆统界线附近的化学地层学特征[J].地层学杂志,2002,26(1):50-54. Wang Darui,Bai Zhiqiang. Chemostratigraphic Characters of the Middle-Upper Devonian Boundary in Guangxi, South China[J]. Journal of Stratigraphy,2002,26(1):50-54.
[28] 邵龙义,Jones T P. 桂中晚二叠世碳酸盐岩碳同位素的地层学意义[J]. 沉积学报,1999,17(1):84-88. Shao Longyi,Jones T P. Carbon Isotopes and the Stratigraphical Impl Ication of the Late Permian Carbonates in Central Guangxi[J]. Acta Sedimentologica Sinica,1999,17(1):84-88.
[29] 田景春,曾允孚.贵州二叠纪海相碳酸盐岩碳、氧同位素地球化学演化规律[J].成都理工学院学报,1995,22(1):78-82. Tian Jingchun,Zeng Yunfu. The Evolution Pattern of the Carbon and Oxygen Isotopes in the Permian Marine Carbonate Rocks from Guizhou[J]. Journal of Chengdu Institute of Technology,1995,22(1):78-82.
[30] 沈渭洲,方一亭,倪琦生,等.中国东部寒武系与奥陶系界线地层的碳氧同位素研究[J]. 沉积学报,1997,15(4):38-42. Shen Weizhou,Fang Yiting,Ni Qisheng,et al. Carbon and Oxygen Isotopic Study Across the Cambrian-Ordovician Boundary Strata in East China[J]. Acta Sedimentologica Sinica,1997,15(4):38-42.
[31] 李玉成.华南晚二叠世碳酸盐岩碳同位素旋回对海平面变化的响应[J].沉积学报,1998,16(3):52-57. Li Yucheng. The Carbon Isotope Cyclostratigraphic Responses to Sea Level Change in Upper Permian Limestones from South China[J]. Acta Sedimentol Sinica,1998,16(3):52-57.
[32] Keith M L, Weber J N. Carbon and Oxygen Isotopic Composition of Selected limestones and Fossils[J]. Geochimica et Cosmochimica Acta, 1964, 28(10/11):1787-1816.

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