Geochemical Characteristics
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Lithosphere ◽  
2021 ◽  
Vol 2021 (Special 5) ◽  
Xiting Long ◽  
Heping Xie ◽  
Xinping Deng ◽  
Xiangyue Wen ◽  
Jian Ou ◽  

Abstract The development of geothermal energy promotes the changing of energy consumption structure in China. A series of experiments were performed to evaluate the geothermal resources of Rucheng County, which is the largest geothermal field in Central South China. The experiments include geothermal exploration, apparent resistivity, and determining the geochemical characteristics of the geothermal water. The experimental results show that the F3 fault zone and F1 hanging wall secondary fault are the main thermal control, heat conduction, water diversion, and thermal storage structures. The pH, EC, and Eh of the river water, shallow groundwater, and geothermal water exhibit seasonal changes. The pH and EC of the geothermal water are higher than those of the river water and shallow groundwater, while the Eh is lower. In addition, the corrosivity coefficient Kk and the Ryznar index are used to evaluate the corrosivity and calcium carbonate scaling of the geothermal water, and it is found that the geothermal water has no corrosiveness or calcium carbonate scaling, which indicates that the geothermal energy in Rucheng County has wide application prospects.

2021 ◽  
Vol 9 (4) ◽  
pp. 160-176
Zénon Itiga ◽  
Benoît Joseph Mbassa ◽  
Rose Noël Ngo Belnoun ◽  
Pierre Wotchoko ◽  
Dieudonné Tchokona Seuwui ◽  

2021 ◽  
Vol 14 (18) ◽  
Yi Zhong ◽  
Peng Xia ◽  
Shitan Ning ◽  
Yong Fu ◽  
Qingguang Li ◽  

Monera Adam Shoieb ◽  
Haylay Tsegab Gebretsadik ◽  
Omeid Rahmani ◽  
Mohd Suhaili Ismail ◽  
Syed Muhammad Ibad

Huan Trinh Dinh ◽  
Tri Luu Cong ◽  
Anh Nguyen Tuan ◽  
Anh Tran Viet ◽  
Giang Phan Hoang ◽  

Abundant granitoids aged 24.59 Ma to 28.62 Ma were exposed along Phu Hoat high metamorphic zone, northern of the Truong Son belt, termed Na Khoun complex in Northern Laos (NL) and Ban Chieng complex in Western Vietnam (WV). Ten granitic samples were collected from these complexes show geochemical characteristics of high SiO2 and K2O contents, medium peraluminous that belong to S-type granites. Initial 87Sr/86Sr isotopic ratios and εNd(t) are broad values of 0.708507 to 0.74539 and -5.22 to -12.66, respectively, together with high 206Pb/204Pb (18.864-19.392), 207Pb/204Pb (15.736-15.841) and 208Pb/204Pb (39.224-40.080) which indicated crustal origin, we suggest that the NL-WV intrusion was associated with transpression form by the India-Asia collision events during Cenozoic.

2021 ◽  
pp. SP518-2021-33
Manoj K. Pandit ◽  
Anthony Pivarunas ◽  
Joseph G. Meert

AbstractThe Archean age granite gneiss basement along the Prydz Bay coastline in East Antarctica hosts N-S, E-W, NE-SW, and NW-SE trending mafic dyke swarms in the Vestfold Hills region that intruded between 2420 and 1250 Ma. The dyke trends do not show a direct correlation with the dyke geochemistry but can be broadly discriminated into high-Mg and Fe-rich tholeiites. The former type being more siliceous, LILE, HFSE, and LREE enriched, crystallized from a fractionated melt with a notable crustal component or fluid enrichment through the previous subduction process. The Fe-rich tholeiites are less siliceous, have lower abundances of LILE and REE, and were derived from an undifferentiated, primitive melt. The geochemical characteristics of both types underline a shallow level and a high degree of melting in the majority of cases, and a broadly Island Arc Basalt (IAB) affinity. Paleomagnetic analysis of hand samples shows directional groups consistent with geochemical groupings. The Vestfold Hills dykes show a possible linkage with the coeval mafic dykes in Eastern Dharwar and Bastar cratons of the South Indian Block, based on the similarity in the Paleoproterozoic paleolatitudes.

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