Study on the characteristics of crust-mantle transition zone in Western Yunnan province

Hu, Hong-Xiang; Lin, Zhong-Yang; Bian, Yinju; Wang, Chunyong; Zhu, L.

doi:10.1007/bf02651047

Cited by 1 publication

(3 citation statements)

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“…The crust is 36-48 km thick along the Ailaoshan-Red River boundary, close to Moho. So this abnormal low-velocity zone may be related to the thermal dynamic conditions at the crust-mantle boundary, and could be explained by the crust-mantle transitional zone near the Red River faulted belt [64,86,88,89] . It is thought that simple ductile-shear along a fault cannot cause temperatures as high as 700 in the the ℃ mid-lower crust.…”

Section: Figurementioning

confidence: 98%

“…Large low-velocity belts at the top of the upper mantle were identified by many researchers [64,86,88,89] . The crust is 36-48 km thick along the Ailaoshan-Red River boundary, close to Moho.…”

Section: Figurementioning

confidence: 99%

“…These have led to an improved understanding of the crust-upper mantle structure and of the main deep fault zones [42,43,[77][78][79][80][81][82][83][84][85][86][87][88][89] .…”

Section: Deep Tectonic Characteristicsmentioning

confidence: 99%

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Deep-seated structure and metallogenic dynamics of the Ailaoshan polymetallic mineralization concentration area, Yunnan Province, China

Deng

Xiao-dong³

et al. 2009

Sci. China Ser. D-Earth Sci.

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Citation: Ge L S, Deng J, Guo X D, et al. Deep-seated structure and metallogenic dynamics of the Ailaoshan polymetallic mineralization concentration area,The Ailaoshan poly-metallic mineralization concentrated area (MCA) consists of the well known Ailaoshan metallogenic belt and adjacent mineral districts and/or deposits. Located in an area of several complex and intersecting tectonic units, the Ailaoshan poly-metallic MCA is controlled by deep crustal and mantle tectonism. Through interpretation of remote sensing images, we identified a large ring structure system that surrounds the MCA. This ring structure encloses regional deep-crustal faults, ductile shear zones, geothermal anomalies, magmatic rocks, and the major mineral deposits, all of which are the reflections of deep tectonic geodynamics that have been long active in this area. Geophysical data indicate that the crust is comprised of relatively stable two or three layers, with some irregular lower-velocity belts. The Moho in the ring sutures occurs as an area of local uplift. There exists an obvious transitional zone between the crust and mantle boundaries. Asthenopheric mantle shows multi-layer upwelling, which indicates multiple events during different geological epochs. It is believed that these mantle events or pulses were responsible for the formation of the regional shear zones, magmatic rocks, and polymetallic orebodies. Furthermore, an integrated metallogenic dynamics model related to the asthenopheric upwelling pulses in the MCA is established, defining events as old as Late Paleozoic.

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Section: Figurementioning

confidence: 98%