Special Issue "UHP Minerals as Messengers of Deep Mantle from the Mantle Transition Zone and Beyond"

A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Mineral Geochemistry and Geochronology".

Deadline for manuscript submissions: 25 November 2023 | Viewed by 1411

Special Issue Editors

Department of Earth and Environmental Sciences, University of Texas at Arlington, Arlington, TX 76019, USA
Interests: mineralogy–petrology; isotope geochemistry; flood basalt volcanism; mass extinction
New Mexico Bureau of Geology & Mineral Resources, New Mexico Institute of Mining & Technology, Socorro, NM 87801, USA
Interests: mantle petrology; HP-UHP minerals; ophiolites; fluid inclusions; impact cratering; origin of life; ore geology
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1. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
2. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100044, China
Interests: ophiolite; mantle peridotite; chromitite; diamond; UHP mineral; geodynamics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Our knowledge of the Earth’s deep mantle is mostly based on experimental and theoretical studies as we cannot sample the deep mantle directly, and rocks from such depths are rare and usually experience retrogression at different pressure–temperature conditions, losing most of the original signatures. To avoid this, we rely on minerals that act as robust containers and show the potential for bringing deep mantle signatures in minerals and inclusions to the Earth’s surface. Diamonds, chromites, and garnets are such potential mineral-container phases. In this Special Issue of Minerals, we invite contributions related to UHP minerals as messengers of the deep mantle from the Mantle Transition Zone and below. Papers can be submitted at any time until the deadline as they will be published on an ongoing basis.

Prof. Dr. Asish Basu
Dr. Souvik Das
Prof. Dr. Jingsui Yang
Guest Editors

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  • microstructures
  • phase transitions
  • garnets, diamonds and chromites
  • ultra-high-pressure minerals
  • mineralogy–geochemistry
  • spectroscopy

Published Papers (1 paper)

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Ultrahigh-Pressure Metamorphism and P-T-t Paths for the Eclogites from the Central Areas of Sulu Orogen, Eastern China
Minerals 2023, 13(3), 362; https://doi.org/10.3390/min13030362 - 04 Mar 2023
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Eclogites from the Guanshan and Yangkou areas of the Sulu orogen consist of garnet, omphacite, phengite, amphibole, quartz/coesite, rutile, and ilmenite. Garnet exhibits weak compositional zoning where Xgr decreases from the core to the mantle and then increases towards the rim, coupled [...] Read more.
Eclogites from the Guanshan and Yangkou areas of the Sulu orogen consist of garnet, omphacite, phengite, amphibole, quartz/coesite, rutile, and ilmenite. Garnet exhibits weak compositional zoning where Xgr decreases from the core to the mantle and then increases towards the rim, coupled with an increase in Xpy from the core to the mantle and then decrease towards the rim. Phase equilibria modelling with pseudosections calculated using THERMOCALC in the NCKFMASHTO system for the Guanshan and Yangkou eclogites records two stages of metamorphism: (I) prograde associated with quick subduction (Stage-I) and (II) retrograde associated with quick exhumation (Stage-II). Stage-I is recorded in the core-mantle zoning of garnet and Si content in phengite in the Guanshan and Yangkou eclogites with a mineral assemblage of Grt-Omp-Amp-Phg-Qtz-Rt ± Lws, and the P-T conditions are constrained at 22–26 kbar and 600–615 °C in Guanshan, while 24–26 kbar and 595–600 °C in Yangkou. The peak P-T conditions (Pmax = 33 kbar; T = 685 °C) of Guanshan eclogites are revealed by the maximum Si content in phengite and the minimum Xgr in the garnet mantle with the mineral assemblage of Grt-Omp-Phg-Coe-Rt ± Lws. The value of Pmax suggests that the subduction depth of the Guanshan eclogites exceeds 110 km. Stage-II is recorded in the mantle-rim zoning of garnet, and its P-T conditions are estimated to be 12–15 kbar and 780–820 °C for the Guanshan eclogites reflected by the assemblage of Grt-Omp-Amp-Pl-LL-Qtz-Rt ± ilm, and 13–14 kbar and 770–790 °C for the Yangkou eclogites by the assemblage of Grt-Omp-Amp-Pl-LL-Qtz-Rt. The two stages of metamorphism in the study areas are overall consistent with the regional metamorphic events, from ultra-high-pressure eclogite facies, through high pressure eclogite facies, to amphibole eclogite facies, with the ages of 245, 227 and 195 Ma, respectively. Full article
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