Geotectonic significance of detrital chromian spinel: a review

Lee, Yong Il

doi:10.1007/bf02910231

Cited by 45 publications

(37 citation statements)

References 23 publications

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“…Three lines of evidence can be used to recognize ophiolitic detritus in sedimentary rocks: (1) serpentinite fragments (Arai and Okada 1991;von Eynatten 2003), (2) anomalously high concentrations of Cr and Ni (Hiscott 1984;Garver and Scott 1995;Garver et al 1996;Totten et al 2000 and references therein), and (3) the oc- currence of Cr-spinels (Stevens 1970;Dick and Bullen 1984;Cookenboo et al 1997;Ganssloser 1999;Hisada et al 1999;Lee 1999).…”

Section: Discussionmentioning

confidence: 99%

From Subduction to Collision in the Northern Tibetan Plateau: Evidence from the Early Silurian Clastic Rocks, Northwestern China

Yang

Cawood³

et al. 2012

The Journal of Geology

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. The University of Chicago Press A B S T R A C TThe Qilian Orogen records early Paleozoic collisional suturing of the Qaidam Block and the Central Qilian Block to the North China Craton. The composition and U-Pb age of detrital zircons and the composition of Cr-spinels from the Early Silurian Lujiaogou and Angzanggou formations in the northern part of orogen indicate derivation from evolving oceanic and continental source terranes. Heavy-mineral chemistry indicates the incorporation of suprasubduction zone-type ophiolitic detritus in addition to continent-derived material. Integrating these chemical and age data with regional data on the duration of subduction-related magmatic activity, syn-and postcollisional granitic rocks, and high-pressure metamorphic rocks constrains the transformation from oceanic subduction to continental collision to 450-440 Ma. The collision resulted in a flood of detritus into the northern part of the orogen from the Central Qilian Block, which masked input from the intervening magmatic arc, implying rapid exposure of the block.

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Section: Discussionmentioning

confidence: 99%

From Subduction to Collision in the Northern Tibetan Plateau: Evidence from the Early Silurian Clastic Rocks, Northwestern China

Yang

Cawood³

et al. 2012

The Journal of Geology

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“…Two main types are illustrated from the studied amphiboles; ferromagnesian amphiboles (magesiohornblende and actinolitic hornblende) and calcic amphiboles (ferroan pargasite and silicic ferro-edenite) are rich in Al and more akin to those of podiform alpine type rather than those of stratiform type. In Alpine-type peridotites, Cr 3+ increases with increasing Fe 3+ , but Fe 3+ concentrations overall remain quite low (Lee 1999). …”

Section: Chromian Spinelsmentioning

confidence: 97%

The Upper Miocene Injana (Upper Fars) Formation of Iraq: insights on provenance history

Al-Juboury

2009

Arab J Geosci

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Petrographic, geochemical, and scanning electron microscope analyses of the sandstone and mudstone units of the Upper Miocene Injana Formation are presented. Furthermore, microprobe analysis for amphiboles, pyroxenes, garnet, and chromian spinels as common heavy mineral species present is done to support other results for better understanding of the provenance history of the Injana Formation. The sandstones of the Injana Formation consist of terrigenous carbonate lithic fragments as common type of sedimentary rock fragments in addition to chert, argillaceous, and rare sandstone fragments. They also include metamorphic and igneous lithic fragments, quartz, feldspars, and mica and generally, the sandstones are lithic arenites and immature. Scanning electron microscopic analysis for the heavy minerals shows that they have been affected by dissolution due to chemical etching and mechanical abrasion through several surface texture generated either in arid and semihumid environment or in diagenetic environment. Clay mineralogy of the mudstone units indicates the presence of illite, chlorite, kaolinite, palygorskite, and illite-smectite mixed layers. Bulk-rock and mineral phase geochemistry in addition to petrographic data suggest the derivation of the Injana Formation from a nearby sources with contribution from igneous, metamorphic, and sedimentary provenance mainly from the high lands in the northeastern parts of Iraq which comprise mainly the Zagros mountains and the older sedimentary formations.

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“…Lherzolite is one of the two main rock types of peridotites in the uppermost mantle, which is less depleted and less common than harzburgite appearing in ophiolites at slow-spreading ridges. Along the Earth's mid-ocean ridges, abyssal peridotites undergo hydration reactions and become serpentinized-especially in slow to ultraslow spreading mid-ocean ridges (Lee, 1999). Abyssal peridotites are characteristically highly altered, with 20%-100% serpentine replacing Tao Chen, Zhenmin Jin, Andy H. Shen and Wei Li 2 olivine and pyroxene (Dick, 1989).…”

Section: Introductionmentioning

confidence: 99%

“…The spinels have a large span in compositions, reflecting their primary magmatic origin and secondary alteration (Khalil and El-Makky, 2009;Lee, 1999;Kimball, 1990). The chemical formula of the spinel group minerals can be expressed by AB 2 O 4 , in which A represents divalent cations and B represents trivalent cations.…”

Section: Introductionmentioning

confidence: 99%

Altered spinel as a petrotectonic indicator in abyssal peridotite from the easternmost part of Southwest Indian Ridge

et al. 2016

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The easternmost part of Southwest Indian Ridge (SWIR) has special crustal structure, magmatic and tectonic processes. Abyssal peridotite from the easternmost part of Southwest Indian Ridge (63.5ºE/28ºS) is serpentinized spinel lherzolite. The accessory spinel has zoned texture, which was studied by petrography, electron probe micro-analysis (EPMA), and backscattered electron (BSE) imaging to reconstruct the petrotectonic and hydrothermal metamorphic history of the host abyssal peridotite. The fresh core is magmatic Al-spinel with low Cr # . The average extent of melting of the abyssal peridotite is about 5.9%. The composition of fresh magmatic spinel core indicates the studied area to be an anomalously thin crust with a melt-poor system. Hydrothermal reaction modifies the chemical composition of magmatic spinel. Ferritchromit is the first product forming the inner rim during pre-serpentinization. The abyssal ferritchromit crystalized as micro-to nano-sized particle with no triple grain boundary, indicating they crystalized in a rapid cooling process during hydrothermal alteration. Chemical compositions of ferritchromit indicate a hydrothermal metamorphism in amphibolite facies. Magnetite in the outer rim was formed by replacement of ferritchromit during syn-or post-serpentinization. Authigenic chlorites crystallized in two events: (1) after formation of ferritchromit crystallized as vein in fracture-zone near the core of spinel and (2) after formation of magnetite crystallized at outermost rim. They are different in compositions, indicating their formation temperature was about 289 ºC and declined to 214 ºC. These results show that the abyssal peridotite had undergone amphibolite to lower-greenschist facies hydrothermal events during pre-to syn-serpentinization or post-serpentinization.

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Geotectonic significance of detrital chromian spinel: a review

Cited by 45 publications

References 23 publications

From Subduction to Collision in the Northern Tibetan Plateau: Evidence from the Early Silurian Clastic Rocks, Northwestern China

From Subduction to Collision in the Northern Tibetan Plateau: Evidence from the Early Silurian Clastic Rocks, Northwestern China

The Upper Miocene Injana (Upper Fars) Formation of Iraq: insights on provenance history

Altered spinel as a petrotectonic indicator in abyssal peridotite from the easternmost part of Southwest Indian Ridge

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