Results 41 to 50 of about 5,793 (215)

Holey Eclogite!

Eos, 2022
Scientists have found holes filled with minerals that indicate fluid-filled pores exist many tens of kilometers below Earth’s surface. But no, The Core fans, you still can’t get amethyst-laden geodes in the mantle.
openaire   +1 more source

Multi‐Mineral Geochronology Across the Neoproterozoic Brasília Nappe Stack: Constraints on Thermal Resetting and Metamorphic Architecture

Terra Nova, EarlyView.
ABSTRACT The Southern Brasília Orogen formed during Western Gondwana's final assembly and comprises nappe systems piled against the São Francisco Craton. We present new rutile U–Pb ages from the lowermost Canastra Group (> 2.2 Ga) and the uppermost Carrancas Group (~560 Ma), integrated with published zircon, monazite, garnet, and mica ages from the ...
Rodrigo Irineu Cerri, Alex J. Choupina A. Silva, Tamiris Pagotti Gonçalves Pinto, Rodrigo Prudente de Melo, George Luiz Luvizotto, Regiane Andrade Fumes, Fabrício de Andrade Caxito, Renato Moraes   +7 more
wiley   +1 more source

THE BELOMORIAN ECLOGITE PROVINCE (EASTERN FENNOSCANDIAN SHIELD, RUSSIA): MESO-NEOARCHEAN OR LATE PALEOPROTEROZOIC?

Геодинамика и тектонофизика, 2020
A critical discussion of competing models of the geodynamic nature (oceanic or continental subduction) and age (Meso-Neoarchean or Late Paleoproterozoic) of the eclogite facies metamorphism in the Belomorian eclogite province (BEP) is based on the ...
M. V. Mints, K. A. Dokukina
doaj   +1 more source

Chronological, geochemical characteristics and tectonic evolution significance of the Sanyan eclogites in the Jinsha River suture zone, eastern Xizang

Dizhi lixue xuebao
Objective  As a key component of the eastern Tethys tectonic domain, the Jinsha River–Ailao Mountain suture zone is widely recognized as a Paleo-Tethys orogenic belt.
TANG Yuan, LI Yiduo, WANG Dongbing, HAN Mingming, LI Xin, LUO Liang   +5 more
doaj   +1 more source

Evidence for oxygen-conserving diamond formation in redox-buffered subducted oceanic crust sampled as eclogite

Nature Communications, 2022
Cratonic eclogite is the product of oceanic crust subduction into the subcontinental lithospheric mantle, and it also is a fertile diamond source rock.
Sonja Aulbach, Thomas Stachel
doaj   +1 more source

Petrology, geochemistry and Ar-Ar geochronology of eclogites in Jinshajiang orogenic belt, Gonjo area, eastern Tibet and restriction on Paleo-Tethyan evolution

China Geology, 2023
: As one of the important Paleo-Tethys suture zones in eastern Tibet, the Jinshajiang orogenic belt is of great significance to study the tectonic evolution of the main suture zone of Paleo-Tethys.
Yuan Tang, Ya-dong Qin, Xiao-dong Gong, Yong Li, Dong-bing Wang, Bao-di Wang   +5 more
doaj   +1 more source

U-Pb Age and Hf Isotope Systematics of Zircon from Eclogite Xenoliths in Devonian Kimberlites: Preliminary Data on the Archaean Roots in the Junction Zone between the Sarmatian and Fennoscandian Segments of the East European Platform

Geosciences, 2021
The results of a laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) U–Pb dating and a Hf isotope study of zircon crystals separated from small eclogite xenoliths found in Devonian kimberlites within the Prypyat horst, Ukraine, have ...
Leonid Shumlyanskyy, Stepan Tsymbal, Monika A. Kusiak, Simon A. Wilde, Alexander A. Nemchin, Iryna Tarasko, Liudmyla Shumlianska, Mandy Hofmann   +7 more
doaj   +1 more source

Equilibrium Silicon Isotope Fractionation in Eclogites and Granites Constrained by Single Crystal X‐Ray Diffraction and the Force Constants Approach

Geophysical Research Letters
Using our recently developed X‐ray diffraction based force constants approach, we have determined the equilibrium Si isotope fractionation between omphacite/garnet, quartz/kyanite, and quartz/zircon at temperatures relevant to the petrogenesis.
Dongzhou Zhang, Jingui Xu, Przemyslaw K. Dera, Bin Chen, Ming Chen   +4 more
doaj   +1 more source

(Table 1) Oxygen and iron isotope ratios of Kaalvallei and Bellsbank eclogite xenoliths

, 2009
(Table 1) Oxygen and iron isotope ratios of Kaalvallei and Bellsbank eclogite ...
Alt, Jeffrey C, Helen M Williams (6970664), Halliday, Alex N, William L Griffin (6970628), Viljoen, Fanus, Norman J Pearson (6970676), Alex N Halliday (6958856), McCammon, Catherine A, Jeffrey C Alt (6958445), Suzanne Y O'Reilley (6970670), Fanus Viljoen (6970679), Pearson, Norman J, Sune G Nielsen (6965477), O'Reilley, Suzanne Y, Catherine A McCammon (6970673), Nielsen, Sune G, Renac, Christope, Williams, Helen M, Griffin, William L, Christope Renac (6970667)   +19 more
core   +1 more source

Seismic visibility of eclogite in the Earth’s upper mantle – implications from high pressure-temperature single-crystal elastic properties of omphacite [PDF]

, 2020
Eclogite, constituting the subducted crust, is one of the most important geochemical and geophysical heterogeneities in the Earth’s mantle. As the dominant anisotropic phase in eclogite, precise high pressure-temperature single-crystal elastic properties
Zhang, Jin S., Zhou, Wen-Yi, Hao, Ming, Wang, Qin   +3 more
core