Juvenile Crust, Mantle Magmatism and Metallogeny of the Central Asian Orogenic Belt:Progress Report of IGCP#592 (original) (raw)
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First China-Russia International Meeting on the Central Asian Orogenic Belt and IGCP-592 Workshop
Episodes
of the tectonic evolution of the southern CAOB occupied the first place of five research fronts in the earth sciences identified by the publisher Elsevier Ltd. The CAOB extends across Russia, China, Kazakhstan, Kyrgyzstan, Uzbekistan, Tajikistan and Mongolia. Due to its huge size, extensive and intensive international cooperation researches and, particularly, across-border comparative studies are necessary to improve our understanding of its long and complex evolution. Consequently, CAOB geologists all agree that it is necessary to build a platform of communication between researchers from Russia, China and other countries to exchange new data and ideas and to discuss and plan future cooperative projects.
Intraplate magmatism in Central Asia and China and associated metallogeny
Ore Geology Reviews, 2009
Large areas of central Asia and mainland China have been affected by intraplate anorogenic magmatism, linked to mantle activity from the Palaeoproterozoic to present day. This magmatism is manifested by layered maficultramafic intrusions, flood basalts, bimodal volcanic rocks, dyke swarms, I-and A-type granitoids, alkaline complexes, carbonatites and kimberlites. In this paper we discuss a selection of these thermal events, namely East Asia Mesozoic-Cenozoic, Siberian Traps, Emeishan, Tarim (Bachu), Yakutsk and South China. Mineral systems that are associated with the Asian intraplate magmatic events include Ni-Cu-PGE in mafic-ultramafic intrusions, porphyry Cu-Mo and skarn deposits, polymetallic veins and auriferous lode deposits generally hosted in granitoids, rare earths and rare metals in alkaline complexes and diamondiferous kimberlites. The anorogenic intraplate igneous rocks originate from mantle sources or mixed mantle and crustal sources and are related, directly or indirectly, to deep mantle plumes or to asthenospheric upwellings that occur in response to lower crust and subcontinental lithosphere delamination linked to collision and subduction processes.
Continental Construction in Central Asia (IGCP- 592): Scientific Results and Meetings in 2012
Episodes
IGCP-Project #592 (2012-2015) “Continental construction in Central Asia”, funded by UNESCOIUGS, was launched in April 2012. The Project focuses on tectonic and magmatic aspects of formation of continental crust in the Central Asian Orogenic Belt and their comparison with actualistic examples from the western Pacific. This report summarizes related scientific results and meetings. In total, in 2012 the Project organized, and/or participated in the organization of, six international conferences and workshops, three of which were accompanied by training schools for young scientists and special training courses. At the present time, more than 250 scientists from 27 countries expressed their interest to collaborate in the frame of our Project, of which more than one third are women and young scientists. Participants come from Australia, Bangladesh, Belgium, Canada, China, Czech Republic, Fiji, Finland, France, Germany, India, Indonesia, Iran, Japan, Kazakhstan, Kyrgyzstan, Mongolia, New ...
Journal of Asian Earth …, 2011
Major elements and Re-Os isotope ratios were analysed in situ on individual sulfide grains in spinel peridotite xenoliths hosted by Quaternary intraplate basalts from the Tariat volcanic field, Central Mongolia. The sulfides are dominantly high-temperature (>900°C) Fe-rich monosulfide solid solution (MSS). Some sulfides with low Ni contents may be residual MSS, whereas other sulfides defining a negative Ni-Cu correlation may be crystallization products of fractionated sulfide melts. The subchondritic 187 Re/ 188 Os and 187 Os/ 188 Os of some sulfides also indicate they are residual MSS. Os isotope compositions of sulfides reveal the presence of Archean to Proterozoic lithospheric mantle beneath the region. The sulfides have T RD model ages ranging from 3.0 to 0.2 Ga, with peaks at 1.5-1.3, 1 and 0.7-0.5 Ga. The peak ages are indicative of significant events in the lithospheric mantle at those times. The timing of these events is remarkably consistent with those of the major crust-building events within the Tarvagatay Terrane where the Tariat volcanic field is located. The similarity in the ranges of crustal U-Pb ages and Nd model ages, and our sulfide Os model ages, suggests that the sulfide ages may date metasomatic events in the underlying lithospheric mantle, which were related to tectonothermal events that affected the overlying crust. Radiometric ages from the Tarvagatay Terrane appear to correspond to the Archean model ages from its SCLM counterpart. The last two events (1.1 and 0.7-0.5 Ga) recorded in the Tarvagatay Terrane suggest involvement of the ''CAOB mantle'' and development of significant juvenile crustal growth in the orogeny.
Continental Construction in Central Asia (IGCP#592): 2013 Meetings and Training Activities
Episodes
a co-organizer and/or co-sponsor of five international meetings (Safonova et al., 2013). This allowed us to continue the successful course of the Project and to attract more participants, especially young scientists and scientists from Central Asian developing countries. In addition to the major goals of our project, i.e. the presence/absence of Gondwana-derived terranes in the Central Asian Orogenic Belt (CAOB), proportions of juvenile and recycled continental crust, and the general comparison with the Western Pacific (Safonova et al., 2011), in 2013 our activities were focused on (i) accretion as part of continental construction; (ii) proportion of accretionary (Pacifictype) and collisional (Alpine-type) orogenic belt in the CAOB; (iii) combination of U-Pb zircon ages with Nd and Hf isotopes for elucidation of magma source characteristics; (iv) formation of PGE and copper porphyry deposits during crustal growth. In this report we summarize our scientific meetings and review the related field trips and training/lecture courses for young scientists. Finally, we advertise our meetings scheduled for 2014. In total, participants from 35 countries joined IGCP#592 related meetings and field visits in 2013