Late Ordovician to early Devonian adakites and Nb-enriched basalts in the Liuyuan area, Beishan, NW China: Implications for early Paleozoic slab-melting and crustal growth in the southern Altaids

2012 ◽  
Vol 22 (2) ◽  
pp. 534-553 ◽  
Author(s):  
Qigui Mao ◽  
Wenjiao Xiao ◽  
Tonghui Fang ◽  
Jingbin Wang ◽  
Chunming Han ◽  
...  
Keyword(s):  
Late Ordovician ◽  
Crustal Growth ◽  
Early Paleozoic ◽  
Slab Melting ◽  
Early Devonian ◽  
Nw China

scholarly journals Provenance and tectonic significance of the Zhongwunongshan Group from the Zhongwunongshan Structural Belt in China: insights from zircon geochronology

2020 ◽  
Vol 12 (1) ◽  
pp. 25-43
Author(s):  
Yuan Peng ◽  
Yongsheng Zhang ◽  
Eenyuan Xing ◽  
Linlin Wang
Keyword(s):  
Detrital Zircon ◽  
Sedimentary Basin ◽  
Early Paleozoic ◽  
Granitic Gneiss ◽  
Metamorphic Belt ◽  
Early Devonian ◽  
Tectonic Environment ◽  
Tectonic Significance ◽  
North Qaidam ◽  
Back Arc

AbstractThe Zhongwunongshan Structural Belt (ZWSB) locates between the Olongbruk Microblock of North Qaidam and the South Qilian Block in China, and it has important implication for understanding the tectonic significance of North Qaidam. Nowadays, there are few discussion on the Caledonian tectonothermal events of the Zhongwunongshan Structural Belt, and there exist different opinions on provenance and tectonic environment of the Zhongwunongshan Group in the ZWSB and its adjacent North Qaidam. In this study, a comprehensive analysis of the detrital zircon geochronological research was carried out on the Zhongwunongshan Group. The detrital zircon U-Pb dating results showed two major populations. The first was Neoproterozoic (966-725 Ma) with a ∈Hf(t) = −15.9 to 9.5, and the other was late Early Paleozoic (460-434Ma) with a ∈Hf(t) = −9.6 to −3.1. In combination with previous research, the dominated provenances were found to be the Neoproterozoic granitic gneiss of the Yuqia-Shaliuhe HP-UHP metamorphic belt and the late Early Paleozoic granite of the Tanjianshan ophiolite-volcanic arc belt in North Qaidam. The Zhongwunongshan Group was deposited in the back-arc sedimentary basin related to the Caledonian collisional orogeny during Middle Silurian-Early Devonian (434-407.9 Ma).

scholarly journals Oribatid mites show that soil food web complexity and close aboveground-belowground linkages emerged in the early Paleozoic

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Ina Schaefer ◽  
Tancredi Caruso
Keyword(s):  
Food Web ◽  
Food Webs ◽  
Higher Plants ◽  
Early Paleozoic ◽  
Soil Food Web ◽  
Deep Time ◽  
Animal Group ◽  
Soil Microarthropods ◽  
Early Devonian ◽  
Food Web Complexity

Abstract The early evolution of ecosystems in Palaeozoic soils remains poorly understood because the fossil record is sparse, despite the preservation of soil microarthropods already from the Early Devonian (~410 Mya). The soil food web plays a key role in the functioning of ecosystems and its organisms currently express traits that have evolved over 400 my. Here, we conducted a phylogenetic trait analysis of a major soil animal group (Oribatida) to reveal the deep time story of the soil food web. We conclude that this group, central to the trophic structure of the soil food web, diversified in the early Paleozoic and resulted in functionally complex food webs by the late Devonian. The evolution of body size, form, and an astonishing trophic diversity demonstrates that the soil food web was as structured as current food webs already in the Devonian, facilitating the establishment of higher plants in the late Paleozoic.

Two contrasting accretion v. collision orogenies: insights from Early Paleozoic polyphase metamorphism in the Altun–Qilian–North Qaidam orogenic system, NW China

2018 ◽  
Vol 474 (1) ◽  
pp. 153-181 ◽  
Author(s):  
Jianxin Zhang ◽  
Chris Mattinson ◽  
Shengyao Yu ◽  
Yunshuai Li ◽  
Xingxing Yu ◽  
...  
Keyword(s):  
Early Paleozoic ◽  
Nw China ◽  
North Qaidam ◽  
Polyphase Metamorphism
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