Characteristics of the paleosol at the Archean - Proterozoic contact in the Aravalli Craton, NW India and paleoclimatic implications
印度西北部阿拉瓦利克拉通太古代-元古代接触面的古土壤特征及其古气候意义
基本信息
- 批准号:45441375
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Grants
- 财政年份:2007
- 资助国家:德国
- 起止时间:2006-12-31 至 2009-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The Archean – Proterozoic contact (APC) in the NW Indian craton is punctuated by several occurrences of white mica-rich lithologies, which are locally quarried in small pits. These Al-rich lithologies (subsequently metamorphosed), described as ‘paleosols’ developed over an Archean granitic basement, offer an ideal setting to deduce ambient atmospheric conditions as they are formed at the atmosphere-lithosphere interface. Previous studies have proposed formation of APC paleosols under oxygen-deficient conditions on the basis of geological and geochemical criteria. Such an interpretation needs to be reassessed in the light of our discovery of an iron-rich horizon from upper part of the Tulsi-Namla section. These paleosols were formed between 2.5 and 2.1 Ga, the interesting time interval of changing atmospheric conditions and our study would provide information not attempted so far from Archean cratons in India. In this proposal we apply for funding for a field study and for high precision geochemical and mineral-chemical data to deduce the paleoweathering conditions. The findings will be compared with similar settings from well-studied Archean terranes in South Africa, Canada and Australia.
印度克拉通西北部的太古宙-元古界接触带(APC)被多次发现的富含白色云母的岩性所打断,这些岩性是在当地的小矿坑中开采的。这些富铝岩性(随后变质)被描述为在太古宙花岗岩基底上发育的“古土壤”,为推断在大气-岩石圈界面形成的环境大气条件提供了理想的环境。前人的研究已经根据地质和地球化学标准提出了缺氧条件下APC古土壤的形成。鉴于我们在图尔西-纳姆拉地段上部发现了富铁的地平线,这种解释需要重新评估。这些古土壤形成于2.5Ga和2.1Ga之间,这是大气条件变化的有趣时间间隔,我们的研究将提供到目前为止印度太古代克拉通还没有尝试过的信息。在这项提案中,我们申请资金进行实地研究,并获得高精度的地球化学和矿物化学数据,以推断古风化条件。这些发现将与南非、加拿大和澳大利亚经过充分研究的太古代地体中的类似环境进行比较。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Professorin Dr. Helga de Wall其他文献
Professorin Dr. Helga de Wall的其他文献
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{{ truncateString('Professorin Dr. Helga de Wall', 18)}}的其他基金
Differences in isotopic signature of Neoproterozoic crust of NW India - evidence for a lithospheric boundary?
印度西北部新元古代地壳同位素特征的差异——岩石圈边界的证据?
- 批准号:
445235288 - 财政年份:2020
- 资助金额:
-- - 项目类别:
Research Grants
Understanding the Neoproterozoic geodynamics of NW India: clues from tectonomagmatic studies of the Cryogenian Sindreth Basin at the eastern Malani Igneous Province
了解印度西北部新元古代地球动力学:来自马拉尼火成岩省东部成冰纪辛德雷盆地构造岩浆学研究的线索
- 批准号:
278247024 - 财政年份:2015
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Research Grants
Microstructural characterisation of ultracataclastic zones in quartzites by electron microscopy
石英岩超碎裂带的电子显微镜微观结构表征
- 批准号:
46793231 - 财政年份:2007
- 资助金额:
-- - 项目类别:
Research Grants
Mechanism of granitoid emplacement in the Pan-African basement of Northern Ethiopia
埃塞俄比亚北部泛非基底花岗岩类侵位机制
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16789105 - 财政年份:2005
- 资助金额:
-- - 项目类别:
Research Grants
Magnetic susceptibility registration in ICDP boreholes - test of a new logging tool
ICDP 钻孔中的磁化率登记 - 新型测井仪的测试
- 批准号:
5363242 - 财政年份:2002
- 资助金额:
-- - 项目类别:
Infrastructure Priority Programmes
Temperaturanomalien in spätvariskischen Kohlebecken am Beispiel des Cinera-Matallana-Sabero Gebietes, Kantabrisches Gebirge, Spanien
以西班牙坎塔布连山脉 Cinera-Matallana-Sabero 地区为例,瓦里西亚晚期煤盆地的温度异常
- 批准号:
5121124 - 财政年份:1998
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Research Grants
Magnetomineralogische Untersuchungen an natürlichen Pyrrhotinen - Vergleich von in situ-Beobachtungen mit experimentellen Daten
天然吡咯烷的磁矿物学研究 - 原位观察与实验数据的比较
- 批准号:
5198200 - 财政年份:1997
- 资助金额:
-- - 项目类别:
Infrastructure Priority Programmes
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