松辽盆地晚白垩世陆表古温度定量重建

doi:10.14027/j.issn.1000-0550.2019.079

松辽盆地晚白垩世陆表古温度定量重建——以LD6⁃7井嫩江组一、二段为例

doi: 10.14027/j.issn.1000-0550.2019.079

基金项目:

国家自然科学基金项目 41790450

中央高校基本科研业务费优秀教师基金项目 2652018119

中国地质大学（北京）大学生创新创业训练计划项目 2018AB004

详细信息

作者简介:
：秦健铭，男，1997年出生，硕士研究生，古气候学，E⁃mail: jmqin@cugb.edu.cn

通讯作者:
高远，男，副教授，E⁃mail: yuangao@cugb.edu.cn

中图分类号: P532
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- 文章访问数: 222
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- 被引次数: 0
出版历程
- 收稿日期: 2019-06-24
- 发布日期: 2020-08-10

Quantitative Paleotemperature Reconstruction of Late Cretaceous Nenjiang Formation in Songliao Basin: A case study of the LD6⁃7 Core

JianMing QIN^1
,,
JiQuan CHEN¹,
Yuan GAO^{1, 2
, ,},
DangPeng XI^{1, 2},
ChengShan WANG^{1, 2}

Funds:

National Natural Science Foundation of China 41790450

Project of Excellent Teachers Fund for Fundamental Research Business Fees in Central Colleges and Universities 2652018119

Innovation and Entrepreneurship Training Program for Undergra duates of China University of Geosciences (Beijing) 2018AB004

摘要

摘要: 松辽盆地嫩江组一、二段是形成于晚白垩世的湖相沉积，保留了丰富的陆地古气候信息。对松辽盆地LD6⁃7井嫩江组一、二段矿物学、地球化学分析及陆表古温度重建，其全岩矿物以黏土矿物含量最多（平均46.2%），石英含量次之（平均21.7%），斜长石和钾长石含量较低。多种风化指数显示嫩江组一、二段具有中等强度的化学风化作用。物源区、搬运和成岩过程对沉积物化学组成的影响分析结果显示：1）降水量较大，2）有一定强度的物理剥蚀，3）分选和沉积再循环作用较弱，4）成岩作用较弱，5）原岩为酸性岩。基于τ_Na⁃MAT转换方程，得到松辽盆地LD6⁃7井嫩江组一、二段沉积时期的陆表古温度为14.2 ℃，属于温带—亚热带气候，与前人研究结果一致。研究证明利用元素地球化学手段重建古温度的方法在松辽盆地嫩江组一、二段具有可行性，可为今后“深时”陆地古气候定量研究提供借鉴。
- 松辽盆地 /
- 嫩江组 /
- 矿物学 /
- 元素地球化学 /
- 古温度
Abstract: The Nenjiang Formation Members 1+2 (K₂n¹⁺²), which formed during the Late Cretaceous in the Songliao Basin, is a lacustrine mudstone deposition, on which abundant terrestrial paleoclimate information is preserved. This study examined mineralogy, as well as the major elemental and trace elemental geochemistry, of K₂n¹⁺² and attempted to reconstruct the terrestrial paleotemperature quantitatively. Results show that the bulk rock mineralogy is mainly composed of clay mineralogy (46.2% average), minor quartz (21.7% average). and negligible plagioclase and K⁃feldspar. Values of the Chemical Index of Alteration (CIA, 63 average), Mafic Index of Alteration for Oxidative condition (MIA⁃O, > 64), Plagioclase Index of Alteration (PIA, > 53), and Weathering Index of Parker (PIA, > 44) indicate medium chemical weathering intensity of K₂n¹⁺². The analysis of the sediment chemical composition by provenance, transportation, and diagenesis satisfies the precondition of calculating the annual mean temperature (MAT) by element geochemistry: (1) High annual precipitation rate (> 400 mm/yr), (2) moderate physical erosion rate, (3) no significant sedimentary sorting and recycling, (4) weak diagenesis, and (5) Chinese acid rock as the protolith. This study suggests a MAT of ~14.19 °C based on the τ_Na-MAT transfer function from K₂n¹⁺² of the LD6⁃7 core in Songliao Basin. This estimated MAT is consistent with previous research results, which is a subtropical climate. It is proven that the method of reconstructing paleotemperature by means of element geochemistry is feasible for K₂n¹⁺² of the LD6⁃7 core in Songliao Basin, which can provide a reference for the quantitative study of the terrestrial paleoclimate concerning "deep time" in the future.
- Songliao Basin /
- Nenjiang Formation /
- mineralogy /
- elemental geochemistry /
- paleotemperature

HTML全文

图 1 松辽盆地简图

Figure 1. A brief geographic map of Songliao Basin

Fig.1

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图 2 LD6⁃7井嫩江组一、二段岩性柱状图

Figure 2. Records of K₂ n ¹⁺² in the LD6⁃7 core

Fig.2

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图 3 LD6⁃7井嫩江组一、二段主量元素组成（%）

Figure 3. Major elemental composition (%) of K₂ n ¹⁺² in the LD6⁃7 core

Fig.3

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图 4 LD6⁃7井嫩江组一、二段微量元素组成（g/t）

Figure 4. Trace elemental composition (g/t) of K₂ n ¹⁺²in the LD6⁃7 core (g/t)

Fig.4

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图 5 LD6⁃7井嫩江组一、二段全岩矿物含量（%）

Figure 5. Bulk rock mineralogical composition (%) of K₂ n ¹⁺² in the LD6⁃7 core (%)

Fig.5

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图 6 嫩江组一、二段物源F1⁃F2图解（修改自Klovan et al.^[41]）

Figure 6. F1⁃F2 diagram for the source of K₂ n ¹⁺² (modified from Klovan et al.^[41])

Fig.6

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图 7 多种化学风化指数计算结果

Figure 7. Statistical results for multiple weathering indices

Fig.7

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图 8 多种化学风化指数和CIA相关性

Figure 8. Correlations of the Chemical Index of Alteration (CIA) with other weathering indices

Fig.8

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图 9 嫩江组一、二段分选作用和沉积再循环作用图解

Figure 9. Diagram for sorting and recycling of K₂ n ¹⁺²

Fig.9

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表 1 LD6⁃7井嫩江组一、二段主量元素组成（%）

Table 1

下载: 导出CSV

表 2 化学风化指数计算公式

Table 2

下载: 导出CSV

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