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Phanerozoic oceanic and climatic perturbations in the context of Tethyan evolution

Science China Earth Sciences 2023年第12期66卷 2791-2806页

作者： Li TIAN Haijun SONG Yuchu LIU Yuyang WU Daoliang CHU Huyue SONG State Key Laboratory of Biogeology and Environmental Geology School of Earth SciencesChina University of Geosciences(Wuhan)Wuhan 430074China

Climatic and environmental conditions play a pivotal role in the evolution of the biosphere,serving as the primary natural factors influencing biological evolution and the development of human *** study of the evolution of Earth's habitability primarily revolves around the reconstruction of climatic and oceanic conditions in geohistorical periods,shedding light on their dynamic *** paper collates classic geological indicators and geochemical proxies associated with paleoclimatic and oceanic environmental *** latest“big data”analyses and simulations made possible by the availability of previously unimagined massive datasets reveal several key findings:During the early Paleozoic,atmospheric oxygen levels were low,and widespread oceanic anoxia was prevalent;the Devonian era witnessed a greenhouse climate,followed by the Carboniferous ice age characterized by higher oceanic oxidation levels and *** latest Paleozoic deglaciation occurred under high pCO_(2) conditions,extending into much of the Mesozoic and early Cenozoic,marked by multiple hyperthermal and anoxia expansion events,until the resurgence of global glaciation in the middle-late stages of the Cenozoic,ultimately bringing environmental and climatic conditions closer to modern *** correlating the aforementioned long-term trends with major geological events,we can delineate the co-evolution of paleoclimate and oceanic environments in tandem with the development of Tethys tectonics as follows.(1)During the Proto-Tethys stage,global paleo-elevations were relatively low,and atmospheric oxygen levels were also relatively *** the occurrence of significant tectonic movements that led to noticeable transgressive-regressive cycles,their effects on climate and oceanic environments were somewhat limited due to the relatively weak interactions.(2)The emergence of the Paleo-Tethys was a significant event that coincided with the formation of the supercontinent Panga

关键词： Paleo-temperature Paleo-redox Paleo-pH tectonic movements Earth's habitability

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辽宁排山楼金矿围岩的岩石学特征(英文)

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地质与资源 2004年第2期13卷 85-95页

作者： Malogo J. M. Kongola 王恩德于明旭 Moustafa El Omella 东北大学资源与土木工程学院辽宁沈阳110004

Standard laboratory procedures and remote sensing techniques were employed in the characterization of gold bearing rocks of the Paishanlou area. Results indicate that, the rocks were formed in an alteration complex of medium temperature and pressure. The area was under intense polymetamorphism (ductile shearing, and hydrothermal metamorphism), which occurred along the deformation zone stretching from Jinzhou to Fuxin. The area bears some propylitic, phyllic (or sericitic) and argillic alteration styles. Gold minerals are contained in fine grained pyrite in silicified zones, and associated with metamorphosed Precambrian rocks. The host rock is composed of gneiss, mylonite and trondhjemite granite, and has a distinctive gold lead geochemical affinity.

关键词： gold host rocks tectonic movements ductile shearing alteration mineralization

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