Results 61 to 70 of about 17,614 (181)

The Archean Granitoid-Paleoproterozoic Unconformity: Superimposition of Alteration Events in Archean Granitoids, Gabon

, 2013
International audienceThe Archean granitoids of the South Gabon, dated from 3.0-to-2.5 Ga, were examined along the Archean-Proterozoic unconformity. The petrography was based on mineralogical identification using electron microscopy, X-ray diffraction ...
El Albani, Abderrazak, Martin, Hervé, Cuney, Michel, Idalina, Mouélé Moubiya, Paquette, Jean-Louis, Gauthier-Lafaye, François, Dudoignon, Patrick   +6 more
core   +1 more source

ISOTOPIC-GEOCHEMICAL ASPECTS OF THE OCCURRENCE OF LIFE ON EARTH IN THE EARLY PRECAMBRIAN

Геохімія техногенезу
The time of the appearance of life and oxygen on Earth is debatable. In order to search for signs of the presence of life and the evolution of the Earth’s outer shells, in particular the time of the appearance of oxygen in the atmosphere,
Demikhov Yu.M., Verkhovtsev V.G., Musich O.G., Borisova N.M., Kravchuk Z.N   +4 more
doaj   +1 more source

Microplate Tectonics Through Earth History and Across Solid Multispheres

Geological Society of China Bulletin, EarlyView.
The evolution of tectonic microplates throughout Earth´s history as well as the transitions between microplates across different solid spheres offers a novel approach to expanding the traditional plate tectonics theory. ABSTRACT The evolution of tectonic microplates throughout Earth's history as well as the transitions between microplates across ...
Sanzhong Li, Yanhui Suo, Jie Zhou, Guozheng Sun, Jianping Zhou, Xianzhi Cao, Bo Liu, Lingli Guo, Zhaoxia Jiang, Qianqian Li, Shujuan Zhao, Long Chen, Xi Wang, Jun Hu, Xiaohui Li, Xiyao Li, Wenyong Duan, Lin Liu, Jie Liu, Guangzeng Wang, Pengcheng Wang, Qingbin Guan, Dingshan Deng, Xu Han, Liangliang Wang, Zihao Hu, Qiuling Liu, Heda Wang, Zihan Tian, Hans‐Peter Schertl   +29 more
wiley   +1 more source

Petrogenesis of the Kanker Granites From the Bastar Craton: Implications for Crustal Growth and Evolution During the Archean-Proterozoic Transition

Frontiers in Earth Science, 2020
Archean-Proterozoic boundary represents a significant transitional phase in the Earth's history. Bastar Craton is one of the major Archean cratons in the Indian subcontinent with voluminous granites, supracrustal rocks, and tectonic belts.
Ajay Dev Asokan, R. Elangovan, Neeraj Vishwakarma, K. R. Hari, M. Ram Mohan   +4 more
doaj   +1 more source

Modelling Patterns of Past Inundation Processes Combining Geoarchaeology and Morphometric Hydrological Analysis in the Shashe‐Limpopo Basin, South Africa

Archaeometry, EarlyView.
ABSTRACT Riverine and valley systems across the globe have been central to the development of past urban centres. By AD 900, the Shashe and Limpopo Rivers seem to have facilitated the interaction and integration of early farming communities in southern Africa. This paper focuses on the application of geoarchaeological perspectives made available by the
B. S. Nxumalo
wiley   +1 more source

Archean mantle [PDF]

, 1989
The workshop considered and discussed evidence for the nature of Earth's Archaen mantle, including its composition, age and structure, influence on the origin and evolution of Earth's crust, and relationship to mantle and crustal evolution of the other ...

core  

Reservoir-forming rules and main controlling factors of Archean buried hill reservoir of middle to northern Liaoxi Uplift in Liaodong Bay area in Bohai Bay Basin

Shiyou shiyan dizhi
The Bohai Bay Basin is one of the key areas for the exploration of buried hill oil and gas resources in China. In order to create a new prospect for the exploration of the Archaean buried hills in this area, the reservoir-forming laws and main ...
Longlong GUO, Jun WANG, Chunguang ZHANG, Hongde CHEN   +3 more
doaj   +1 more source

Evaluation of the Rb/Sr ratio as an indicator of chemical weathering: a case study from five sedimentary sections in Northeast China

Boreas, EarlyView.
Chemical weathering plays a pivotal role in the Earth's surface material cycle and global climate regulation. It not only facilitates the reconstruction of palaeoclimate characteristics but also provides essential insights into Earth's evolutionary history.
Zhenyu Wei, Yuanyun Xie, Jie Meng, Lei Sun, Chunguo Kang, Yunping Chi, Peng Wu, Haijin Liu, Ruonan Liu, Ruitong Chang   +9 more
wiley   +1 more source

Geological Mapping of Fortuna Tessera (V-2): Venus and Earth's Archean Process Comparisons [PDF]

, 2008
The geological features, structures, thermal conditions, interpreted processes, and outstanding questions related to both the Earth's Archean and Venus share many similarities and we are using a problem-oriented approach to Venus mapping, guided by ...
Hurwitz,D. M., Kumar, P. Senthil, Head, James W., Ivanov, M. A., Basilevsky, A. T.   +4 more
core  

The Medicine Hat Block and the Early Paleoproterozoic Assembly of Western Laurentia

Geosciences, 2020
The accretion of the Wyoming, Hearne, and Superior Provinces to form the Archean core of western Laurentia occurred rapidly in the Paleoproterozoic. Missing from Hoffman’s (1988) original rapid aggregation model was the Medicine Hat block (MHB).
Jennifer N. Gifford, Shawn J. Malone, Paul A. Mueller   +2 more
doaj   +1 more source