Slab break-off and the formation of Permian mafic–ultramafic intrusions in southern margin of Central Asian Orogenic Belt, Xinjiang, NW China

Song, Xie‐Yan; Xie, Wenchun; Deng, Yue; Crawford, Anthony J.; Zhong, Wenqin; Zhou, Guofu; Deng, Gang; Cheng, Songlin; Li, Jun

doi:10.1016/j.lithos.2011.08.011

Cited by 115 publications

(31 citation statements)

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“…Delamination of dense melting residua and consequent upwelling of asthenospheric mantle has been suggested by some authors (Bédard, 2006, Song et al, 2011. More plausibly, the standard "mushroom-shaped" tail and head plume model is over simplistic, particularly for plumes containing A C C E P T E D M A N U S C R I P T…”

Section: Size Of Magma Systems Mantle Sources and Timing Of Mineralimentioning

confidence: 98%

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The mineral system approach applied to magmatic Ni–Cu–PGE sulphide deposits

Barnes

Cruden

Arndt

et al. 2016

Ore Geology Reviews

225

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Most magmatic Ni-Cu-PGE sulphide deposits occur within long-lived magma pathways fed by high degree partial melts of the mantle. Holistic mineral-system analysis for such deposits has some parallels with dominantly hydrothermal systems, but also some important differences.Major provinces are associated with large volumes of magma erupted at margins of ancient Archaean cratons, and are associated with small intrusions through which large volumes of magmas have passed. There is no demonstrable association with any particular magma type, although in most provinces the ores are found associated with the most primitive available magmas, whatever these may be. Or-bearing intrusions tend to form early in the evolution of the host province, although exceptions exist to this rule, and these intrusions typically account for very small proportions of the volumes of the province as a whole.Ore deposition is favoured by prolonged high-volume flow over a horizontal floor. This floor may take the form of the base of a channelized sill, tube or blade-shaped dyke, which account for most of the known host igneous bodies to significant ore deposits. Deposition mechanisms may be chemical or physical, but large high-grade deposits require a major component of transported sulphide liquid, initially carried as droplets. Late stage migration of sulphide liquid as gravity currents within intrusion networks, coupled with infiltration and melting of floor rocks, accounts for the common observation in mafic intrusion hosted deposits of cross cutting relationships between massive sulphides, host intrusions and country rocks.The following set of criteria is proposed in targeting and evaluating Ni-Cu-PGE sulphide systems: 1) nature of magmatism and relationship to pre-existing cratonic architecture; 2) magmatic and structural controls on the development of protracted-flow magma conduits; 3) access to crustal S A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPTNi-Cu-PGE mineral systems Barnes May 2015 2 sources at some point along the pathway; 4) favorable intrusion geometry and emplacement style for deposition, reworking and upgrading of sulphide magmas, and 5) favorable structural history and erosional level for preservation and detectability.These components can be translated into mappable geological criteria. At the predictive targeting scale, the key features are proximity to ancient cratonic boundaries and long-lived, trans-crustal structures, and relationship to voluminous mafic or ultramafic magmatism typically with high Mg and low Ti contents, but otherwise lacking distinctive characteristics. At the detection scale, there are two distinct approaches: recognition of high volume magma pathways with prolonged flow-through operating at length scales of km based on morphological, petrological, geophysical and structural observations; and identification of the petrographic and geochemical signals of accumulation or extraction of sulphide liquid.

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Section: Size Of Magma Systems Mantle Sources and Timing Of Mineralimentioning

confidence: 98%

“…The trend of small intrusion-hosted deposits along the southern edge of the Central Asian Orogenic Belt has been attributed to magma sources related to slab delamination associated with continental collision event (Song et al, 2011, Li et al, 2012.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

The mineral system approach applied to magmatic Ni–Cu–PGE sulphide deposits

Barnes

Cruden

Arndt

et al. 2016

Ore Geology Reviews

225

View full text Add to dashboard Cite

show abstract

“…Yang et al (2011a) suggested a slab break-off model on the basis of geochemical results for A-type granites in the study area. Yuan et al (2010) and Song et al (2011) also argued that the late Carboniferous to early Permian granites and mafic-ultramafic intrusions in the eastern and central Tianshan terrane could be linked to slab break-off. All these findings indicate that slab break-off was an important geodynamic process in the eastern Junggar terrane and neighbouring areas during the late Carboniferous.…”

Section: Late Carboniferousmentioning

confidence: 99%

Geochemistry and geochronology of Carboniferous volcanic rocks in the eastern Junggar terrane, NW China: Implication for a tectonic transition

et al. 2012

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“…Although several papers have dealt with the aspects of regional geology, geochronology and geochemistry Zhou et al, 2004Zhou et al, , 2009Song et al, 2011;Zhang et al, 2010), detailed studies are still rare. In this issue, studied the geochemistry of the rock-forming minerals and discussed magma evolution and mineralization.…”

Section: Western Part Of the Caobmentioning

confidence: 99%