Petrology and geochemistry of mantle peridotites from the Kalaymyo and Myitkyina ophiolites (Myanmar): Implications for tectonic settings

Lithos ◽  
2016 ◽  
Vol 264 ◽  
pp. 495-508 ◽  
Author(s):  
Chuan-Zhou Liu ◽  
Chang Zhang ◽  
Yang Xu ◽  
Jian-Gang Wang ◽  
Yi Chen ◽  
...  
Keyword(s):  
Mantle Peridotites ◽  
Petrology And Geochemistry ◽  
Tectonic Settings

scholarly journals Subduction-Induced Fractionated Highly Siderophile Element Patterns in Forearc Mantle

Minerals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 339 ◽  
Author(s):  
Yang Xu ◽  
Chuan-Zhou Liu
Keyword(s):  
New Caledonia ◽  
Melt Extraction ◽  
Highly Siderophile Elements ◽  
Group I ◽  
Mantle Peridotites ◽  
Tectonic Settings ◽  
Siderophile Elements ◽  
Fe Alloys ◽  
Slab Dehydration ◽  
Forearc Mantle

Compositions of highly siderophile elements (HSEs) in forearc mantle have been little studied and effects of slab dehydration on their abundances in forearc mantle remains unclear. This study reports two different kinds of HSE patterns for peridotites from a New Caledonia forearc ophiolite. The Group-I samples show relatively flat patterns of Ir-group-platinum-group elements (IPGEs) and enrichment of Pt over Pd. Such patterns imply that interstitial sulfides were significantly removed through melt extraction, whereas sulfides enclosed within silicates were mostly unaffected. Meanwhile, Pt-Fe alloys were generated, resulting in suprachondritic Pt/Pd ratios. In contrast, the Group-II samples display convex HSE patterns and are depleted in all HSEs except for Ru, yielding strongly positive Ru anomalies. This indicates that both enclosed and interstitial sulfides were substantially consumed, whereas chromite was generated to stabilize Ru. Compared to abyssal peridotites, subduction-related peridotites commonly have stronger fractionation in the HSEs. Therefore, the HSE data of mantle peridotites are potentially able to discriminate the tectonic settings of ophiolites.

scholarly journals Petrology and geochemistry of meta-ultramafic rocks in the Paleozoic Granjeno Schist, northeastern Mexico: Remnants of Pangaea ocean floor

2017 ◽  
Vol 9 (1) ◽  
Author(s):  
Sonia Alejandra Torres-Sánchez ◽  
Carita Augustsson ◽  
Uwe Jenchen ◽  
J. Rafael Barboza-Gudiño ◽  
Eduardo Alemán Gallardo ◽  
...  
Keyword(s):  
Ocean Floor ◽  
Ultramafic Rocks ◽  
Upper Paleozoic ◽  
Petrology And Geochemistry ◽  
Northeastern Mexico ◽  
Tectonic Settings

AbstractThe Granjeno Schist is a meta-volcanosedimentary upper Paleozoic complex in northeastern Mexico. We suggest different tectonic settings for metamorphism of its serpentinite and talc-bearing rocks based on petrographic and geochemical compositions. According to the REE ratios (La

scholarly journals Modeling of Olivine and Clinopyroxene Fractionation in Intracontinental Alkaline Basalts: A Case Study from the Carpathian-Pannonian Region

2021 ◽  
Author(s):  
Tamás Sági ◽  
Szabolcs Harangi ◽  
Theodoros Ntaflos
Keyword(s):  
Trace Element ◽  
Fractionation Process ◽  
Ocean Island ◽  
Ocean Island Basalts ◽  
Mantle Peridotites ◽  
Petrology And Geochemistry ◽  
Mantle Petrology ◽  
Basaltic Melts ◽  
Primary Melt

Besides mantle peridotites primary basaltic melts are the best tool to investigate upper mantle petrology and geochemistry. However, de facto primitive melts are hard to found, as basaltic melts usually go through a fractionation process during their ascent towards the surface. Most primary melt calculators are based on the major or trace element compositions of olivine-phyric ocean island basalts and peridotites and are less accurate if clinopyroxene fractionation occurred. In this chapter a new fractionation modeling method of alkaline basalts will be introduced, which has been published earlier only in Hungarian. Olivine ± clinopyroxene fractionation of four basaltic volcanoes have been modeled from different Miocene-Quaternary volcanic fields from the Carpathian-Pannonian Region (Stiavnica (Selmec) VF, Novohrad-Gemer (Nógrád-Gömör) VF, Perşani Mts. (Persányi Mts.) VF and from the Lucaret-Sanoviţa (Lukácskő-Sziklás) volcano.

TECTONIC SETTINGS AND METALLOGENISM OF THE EASTERN SEGMENT OF THE QIN-HANG BELT, SOUTH CHINA

2013 ◽  
Vol 32 (5) ◽  
pp. 57-66 ◽  
Author(s):  
Lei XU ◽  
Sanzhong LI ◽  
Xin LIU ◽  
Yanhui SUO ◽  
Qi WU ◽  
...  
Keyword(s):  
South China ◽  
Eastern Segment ◽  
Tectonic Settings

THE TECTONIC SIGNIFICANCE OF (OLD) ZIRCON IN OCEANIC MANTLE PERIDOTITES AND CHROMITITES

2017 ◽  
Author(s):  
Paul T. Robinson ◽  
◽  
Jingsui Yang ◽  
Jianwei Li ◽  
Zhang Duan ◽  
...  
Keyword(s):  
Mantle Peridotites ◽  
Tectonic Significance
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