苏北浅滩钙结核的特征及其环境指示意义

刘颖; 韩喜球; 刘杜娟

doi:10.3969/j.issn.0253-4193.2014.12.010

苏北浅滩钙结核的特征及其环境指示意义

doi: 10.3969/j.issn.0253-4193.2014.12.010

1.
国家海洋局第二海洋研究所国家海洋局海底科学重点实验室, 浙江杭州 310012
2.
国家海洋局第二海洋研究所工程海洋学重点实验室, 浙江杭州 310012

基金项目: 国家自然科学基金 (40976040); 浙江省杰出青年基金(R5110215)。

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出版历程
- 收稿日期: 2014-01-15
- 修回日期: 2014-03-27

Characteristics of calcareous concretions from the Northern Jiangsu Shoal and their significance on palaeoenvironment

1.
Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
2.
Key Laboratory of Engineering Oceanography, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

摘要

摘要: 对采自苏北浅滩的钙结核样品进行了岩石学、矿物学和碳氧同位素的分析。样品富含石英和长石砂屑,碳酸钙胶结,其碳和氧同位素组成分别为-8.38‰~-8.19‰ V-PDB及-5.23‰~-5.03‰ V-PDB。根据样品的氧同位素组成,利用碳酸盐-水体系氧同位素方程,结合现今底层水温度,并考虑可能存在的温度变化,计算得到古沉淀流体的δ¹⁸O_水范围为-4.72‰~-4.52‰ V-SMOW,较正常海水偏负,认为钙结核的形成可能受到了淡水影响。根据结核中碎屑矿物的成分及其成熟度,判断其包含的碎屑矿物源自古黄河,认为这些结核样品可能形成于海陆交互环境,形成时间约为7~6.5 ka BP左右,当时古海平面高度比现今低10 m左右,古黄河河道可能位于苏北浅滩附近。
- 苏北浅滩 /
- 钙结核 /
- 氧同位素 /
- 古沉积环境恢复 /
- 古黄河
Abstract: This paper presented comprehensive petrological,mineralogical and C-and O-isotope analysis on calcareous concretions from the Northern Jiangsu Shoal. These samples were abundant with fragments of quartz and feldspar,and cemented by calcite. The C- and O-isotope ratios of the carbonates were as follows: δ¹³C is -8.38‰--8.19‰ V-PDB and δ¹⁸O is -5.23‰--5.03‰ V-PDB. Based on their O-isotope compositions and the possible formation temperatures,the oxygen isotopic fractionation between calcite and water was used to estimate the equilibrium δ¹⁸O values of the precipitating fluids. The calculated equilibrium δ¹⁸O values of the precipitating fluids ranged from -4.72‰ to -4.52‰ V-SMOW,which were lighter than present seawater. It is considered that freshwater involved in the formation of calcareous concretions,and they formed in terrestrial environmentAccording to the composition of detrital minerals contained in the concretions and also the Quartz/feldspar ratios (index of maturity),it is suggested that the concretions were originated from Ancient Yellow River. About 7-6.5 ka BP,the Ancient Yellow River flew by the Northern Jiangsu Shoal.
- the Northern Jiangsu Shoal /
- calcareous concretions /
- oxygen isotope /
- palaeoenvironment /
- Ancient Yellow River

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参考文献(37)

蓝先洪,张宪军,王红霞,等. 南黄海NT2孔沉积地球化学及其物源[J]. 海洋地质与第四纪地质,2008,28(1): 51-60.

王永吉,刘敏厚,吴世迎. 黄海陆架晚第四纪沉积物中的古土壤[J]. 海洋学报,1986,8(4): 466-475.

孟广兰,韩有松,王少青. 南黄海陆架区15 ka以来的古气候事件与环境演变[J]. 海洋与湖沼,1998,29(3): 297-305.

陈志华,石学法,王湘芹,等. 南黄海B10岩心的地球化学特征及其对古环境和古气候的反映[J]. 海洋学报,2003,25(1): 69-77.

王昊寅,刘东生,龙海燕. 南黄海泥质区YS01A孔有孔虫及其环境意义[J]. 海洋湖沼通报,2013(2): 128-135.

Yemane K,Kelts K. Isotope geochemistry of Upper Permian early diagenetic calcite concretions: Implications for Late Permian waters and surface temperatures in continental Gondwana[J]. Palaeogeography,Palaeoclimatology,Palaeoecology,1996,125(1/4): 51-73.

Zhou J,Chafetz S H. The genesis of late Quaternary caliche nodules in Mission Bay,Texas: stable isotopic compositions and palaeoenvironmental interpretation[J]. Sedimentology,2009,56(5): 1392-1410.

王颖,朱大奎,曹桂云. 潮滩沉积环境与岩相对比研究[J]. 沉积学报,2003,21(4): 539-546.

朱大奎,柯贤坤,高抒. 江苏海岸潮滩沉积的研究[J]. 黄渤海海洋,1986,4(3): 19-27.

郑铁民,秦蕴珊. 黄东海浅水区海底钙质结核及其成因的研究[J]. 沉积学报,1986,4(2): 47-57.

刘敏厚,吴世迎,王永吉. 黄海晚第四纪沉积[M]. 北京: 海洋出版社,1987: 335-347.

吴世迎,房泽诚. 黄海海州湾钙结体的特征及其地质意义[J]. 地质科学,1982(2): 207-216.

吴世迎. 黄海钙结体的碳氧同位素特征[J]. 海洋通报,1985,4(1): 52-57.

王振宇. 南黄海海州湾外侧钙质结核特征及其成因的研究[J]. 上海地质,1990(2): 9-19.

李延军. 南黄海辐射沙脊群小庙洪潮流通道晚更新世以来的沉积环境演变[D]. 南京: 南京大学,2012.

孙嘉诗,崔一录. 南黄海晚更新世钙质砂岩及其地质意义[J]. 海洋地质与第四纪地质,1987,7(3): 21-31.

朱而勤. 东海高镁方解石结核的矿物学特征[J]. 科学通报,1985(9): 689-693.

卢健. 南黄海西部晚更新世末期以来沉积特征及其物源环境意义[D]. 青岛: 中国科学院海洋研究所,2013.

朱而勤. 黄海和东海钙质结核的特征及成因[J]. 海洋学报,1985,7(3): 333-341.

朱而勤. 东海北部的钙质结核[J]. 中国科学:B辑,1983,13(9): 849-856.

谢福缘. 黄海晚更新世沉积环境的演变[J]. 海洋学报,1986,8(6): 708-713.

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.

Urey H C. The thermodynumic properties of isotopic substances[J]. Journal of the Chemical Society,1947,152: 562-581.

陈选博,韩喜球. 南海东北陆坡烟囱状冷泉碳酸盐岩生长剖面的碳、氧同位素特征与生长模式[J]. 沉积学报,2013,31(1): 50-55.

Kim S T,O'Neil J R. Equilibrium and nonequilibrium oxygen isotope effects in synthetic carbonates[J]. Geochimica et Cosmochimica Acta,1997,61(16): 3461-3475.

Han X Q,Yang K H,Huang Y Y. Origin and nature of cold seep in northeastern Dongsha area,South China Sea: Evidence from chimney-like seep carbonates[J]. Chinese Science Bulletin,2013,58(30): 3689-3697.

McCrea J M. On the isotopic chemistry of carbonates and a paleotemperature scale[J]. The Journal of Chemical Physics,1950,18(6): 849-857.

Coplen T B,Kendall C,Hopple J. Comparison of stable isotope reference samples[J]. Nature,1983,302(5905): 236-238.

鞠霞,熊学军. 渤、黄、东海水温季节变化特征分析[J]. 海洋科学进展,2013,31(1): 55-68.

孙白云. 黄河、长江和珠江三角洲沉积物中碎屑矿物的组合特征[J]. 海洋地质与第四纪地质,1990,10(3): 23-33.

郑洪汉. 黄土高原黄土-古土壤的矿物组成及其环境意义[J]. 地球化学,1994,23(S1): 113-123.

郭旭东. 晚更新世以来中国海平面的变化[J]. 地质科学,1979(4): 330-341.

李凡,于建军,姜秀珩,等. 南黄海埋藏古河系研究[J]. 海洋与湖沼,1991,22(6): 501-508.

Park S C,Lee H H,Han H S,et al. Evolution of late Quaternary mud deposits and recent sediment budget in the southeastern Yellow Sea[J]. Marine Geology,2000,170(3/4): 271-288.

高抒. 中国东部陆架全新世沉积体系: 过程-产物关系研究进展评述[J]. 沉积学报,2013,31(5): 845-855.

宋召军,黄海军,王珍岩,等. 苏北潮滩的近期变化分析[J]. 海洋科学,2008,32(6): 25-29.

Liu J P,Milliman J D,Gao S. Holocene development of the Yellow River's subaqueous delta,North Yellow Sea[J]. Marine Geology,2004,209(1/4): 45-67.

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