Mid-ocean ridge (MOR) and suprasubduction zone (SSZ) geological events in the Yarlung Zangbo suture zone: Evidence from the mineral record of mantle peridotites

Guo, Guolin; Yang, Jingsui; Liu, Xiaodong; Xu, Xing; Liu, Zhao; Ba, Dengzhu

doi:10.1016/j.jseaes.2015.02.012

Cited by 14 publications

(5 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Off-line data processing was performed using the GLITTER 4.0 program. The lherzolite and harzburgite of the Purang ophiolite have similar petrological features, mineral assemblages and mineral major oxide compositions, which have been widely documented in previous studies [29,[49][50][51]69]. There are, however, some unique features that differentiate these lherzolites and harzburgites.…”

Section: Trace Element Analysissupporting

confidence: 63%

“…The ultramafic massif is dominated by harzburgite with yellowish-brown weathering surfaces ( Fig. 2a), but subordinate lherzolite occurs as massive bodies in the northern part of the ophiolite and as small lenses randomly distributed in the harzburgite [49][50][51] (Fig. 1c).…”

Section: Purang Ophiolitementioning

confidence: 99%

“…1c), but mafic dykes and veins are also scattered in the harzburgites [54][55][56]. In addition, pyroxenite veins are also common in the harzburgite massif [50]. Diabase dykes have zircon U-Pb ages of ca.…”

Section: Purang Ophiolitementioning

confidence: 99%

See 2 more Smart Citations

Distinctive melt activity and chromite mineralization in Luobusa and Purang ophiolites, southern Tibet: constraints from trace element compositions of chromite and olivine

Zhou

Jing

et al. 2019

Science Bulletin

View full text Add to dashboard Cite

Section: Trace Element Analysissupporting

confidence: 63%

Section: Purang Ophiolitementioning

confidence: 99%

See 1 more Smart Citation

Distinctive melt activity and chromite mineralization in Luobusa and Purang ophiolites, southern Tibet: constraints from trace element compositions of chromite and olivine

Zhou

Jing

et al. 2019

Science Bulletin

View full text Add to dashboard Cite

“…It has been traditionally interpreted as one of the major suture zones in the Earth that formed during the India-Asia continental collision, following the terminal closure of the Neotethys (Aitchison et al, 2011;Hu et al, 2016). Mafic-ultramafic rock assemblages in different ophiolite massifs and mélanges along the YZSZ have been studied extensively during the past 30 years (i.e., Miller et al, 2003;Liu et al, 2010;Bezard et al, 2011;Dai et al, 2011;Guilmette et al, 2012;Hébert et al, 2012;Guo et al, 2015;Li et al, 2015;Niu et al, 2015;Lian et al, 2016Lian et al, , 2017Feng et al, 2017). Geodynamic models explaining the geochemical evolution of the YZSZ ophiolites, their tectonic origin of magmatic construction within a broad Neotethys oceanic realm, and the paleography of this Mesozoic-Cenozoic ocean basin vary significantly Dai et al, 2013;C.…”

Section: Introductionmentioning

confidence: 99%

Melt evolution of upper mantle peridotites and mafic dikes in the northern ophiolite belt of the western Yarlung Zangbo suture zone (southern Tibet)

et al. 2018

Self Cite

View full text Add to dashboard Cite

The Yarlung Zangbo suture zone (YZSZ) in southern Tibet is divided by the Zhongba terrane into two subparallel belts in its western end. The northern belt (NB) is tectonically juxtaposed against an accretionary prism complex and the Gangdese magmatic arc of Eurasia along dextral oblique-slip faults. Peridotite massifs in this belt are intruded by mafic dikes, providing critical geochemical, geochronological, and isotopic information about the melting-melt extraction history of the Tethyan mantle. Peridotites consist of harzburgite and clinopyroxene harzburgite with minor Iherzolite and dunite-chromitite. Dolerite and microgabbro dikes crosscutting these peridotites display U-Pb zircon ages of 128-122 Ma, and show normal mid-oceanic ridge basalt (N-MORB) like rare earth element patterns with negative Nb, Ta, and Ti anomalies, high ε Nd (t) Pb of 37.724-37.845, suggesting that their N-MORB-like mantle source was modified by island arc melts. Slab rollback-induced extension in an arc-trench system along the Eurasian continental margin led to ~7%-12% partial melting of subduction-influenced, spinel lherzolite peridotites, producing dike magmas. The NB peridotite massifs and ophiolites thus represent a suprasubduction zone oceanic lithosphere formed in close proximity to the late Mesozoic active continental margin of Eurasia.

show abstract

“…Normalizing values are from[54]. The compositions of the Purang peridotites from the Yarlung Zangbo suture zone[51], harzburgites from the Kermanshah ophiolitic complex[55], mantle peridotites from the Internal[56] and External[57] Ligurides of the Northern Apennines and depleted MORB mantle (DMM) of[50], are shown for comparison.…”

mentioning

confidence: 99%

Tectono-Magmatic Setting of the Divar Deposit, Eastern Iran: Evidences for VMS Mineralzation

Pourkaseb¹,

Zarasvandi²,

Adelpour³

et al. 2017

Preprint

View full text Add to dashboard Cite

The Divar VMS deposit is located in the Nehbandan ophiolite complex (NOC). It is hosted in the Sistan suture zone (SSZ) marking the boundary between the Lut and Afghan continental blocks. This area is composed mainly of various ophiolitic rock units representing a tectono-sedimentary mélange, which are commonly interpreted as being the remnants of Sistan oceanic lithosphere. The major host rocks cropping out in the Divar deposit are mantle peridotites include clinopyroxene-(cpx-) rich harzburgites and depleted harzburgites with gabbronorite, cumulate gabbro, basalt and pelagic sediments. They are interpreted as being related to the rifting and subsequent Late Triassic continental break-up of the southern Neothethys. In this study petrographic observations mineral chemistry with whole rock chemistry, and rare earth element (REE) modeling were carried out on the different rocks associated with Divar deposit. The presented data led to the following conclusions: (1) The depleted harzburgites proved to be related to the residual mantle after 18-22% removal of melts. This is comparable with abyssal peridotites; (2) The cpx-rich harzburgites represent the residual mantle after the removal of 11-13% mid-ocean ridge basalt-type (MORB). Subsequently, the residual mantle was enriched in light REE (LREE) by subduction-derived fluids; (3) The gabbronorite and cumulate gabbro represents a portion of oceanic crust generated in a mid-ocean ridge setting; (4) The basalts belong to the N-MORB-type with no considerable crustal contamination. From the top to bottom, the Divar deposit is characterized a gossan zone, a thick massive ore zone, and a poorly developed stockwork zone. In Divar deposit, host rocks are indicated by serpentinized peridotites and severely altered mafic rocks that include disseminated and stockwork ore under massive lenses. These rocks showed a mineral assemblage of carbonate + quartz-jasper + chlorite + albite + epidote that demonstrate greenschist facies ocean floor metamorphism. Moreover, in the footwall rocks, sericitization and hematitization are also observed. Primary mineralization includes bedded ore, sulphide breccias, stockworks and chimney fragments. Ore mineral abundances decrease from pyrite, magnetite, to chalcopyrite, and sphalerite. Highlightly, there are two distinct mineralization phases' namely massive sulphide (stage-1) and massive magnetite (stage-2). The spatial relationships with the host rocks and textural evidence (e.g., magnetite replacing sulphides) indicate that sulphide minerals and magnetite were generated in different stages. The transition from sulphide to magnetite mineralization is interpreted as being related to the variation of H2S content in the ore fluids. The massive sulphide ore (stage 1) might have formed by primary hydrothermal fluids enriched in H2S and Fe. The second stage (massive magnetite) seem to be related to the later hydrothermal fluids enriched in Fe but poor in H2S, replacing the pre-existing sulphide minerals. The lithological features (stockwork/massive or...

show abstract

Mid-ocean ridge (MOR) and suprasubduction zone (SSZ) geological events in the Yarlung Zangbo suture zone: Evidence from the mineral record of mantle peridotites

Cited by 14 publications

References 59 publications

Distinctive melt activity and chromite mineralization in Luobusa and Purang ophiolites, southern Tibet: constraints from trace element compositions of chromite and olivine

Distinctive melt activity and chromite mineralization in Luobusa and Purang ophiolites, southern Tibet: constraints from trace element compositions of chromite and olivine

Melt evolution of upper mantle peridotites and mafic dikes in the northern ophiolite belt of the western Yarlung Zangbo suture zone (southern Tibet)

Tectono-Magmatic Setting of the Divar Deposit, Eastern Iran: Evidences for VMS Mineralzation

Contact Info

Product

Resources

About