Results 51 to 60 of about 151,236 (376)

Expanding the application of the Eu-oxybarometer to the lherzolitic shergottites and nakhlites: Implications for the oxidation state heterogeneity of the Martian interior [PDF]

, 2009
Experimentally rehomogenized melt inclusions from the nakhlite Miller Range 03346 (MIL 03346) and the lherzolitic shergottite Allan Hills 77005 (ALH 77005) have been analyzed for their rare earth element (REE) concentrations in order to characterize the ...
Elkins-Tanton, Linda, McCanta, Molly C., Rutherford, Malcolm J.   +2 more
core   +1 more source

Characterization of the permeability evolution of hard and soft rocks under hydro‐mechanical coupling conditions

Deep Underground Science and Engineering, EarlyView.
The permeability variation of rocks during complete stress–strain processes was investigated. A mathematical model describing the influence of rock damage on permeability was constructed. The permeability–stress relationship between soft rock and hard rock was proposed.
Zhen Huang, Jian Yu, Yun Wu, Cong Gong, Xiaozhao Li, Kui Zhao, Dickson Moyo   +6 more
wiley   +1 more source

ALL-RUSSIA CONFERENCE «FLUID REGIME OF ENDOGENIC PROCESSES IN THE CONTINENTAL LITHOSPHERE», IRKUTSK, RUSSIA, OCTOBER 6–9, 2015

Геодинамика и тектонофизика, 2015
Chronicle of All-Russian conference “Fluid regime of endogenic processes of continental lithosphere” devoted to 50 anniversary of Laboratory of petrology, geochemistry and ore genesis of the Institute of the Earth’s crust is presented.
F. A. Letnikov, Yu. V. Danilova, T. S. Sokolova, A. V. Levin   +3 more
doaj   +1 more source

Geological structure and petrology of the Nizhne-Sinyachikhinsky granitoid massif (Alapayevsk-Sukhoi Log porphyry copper zone, the Middle Urals)

Литосфера, 2020
Research subject. The geological structure and rock composition of the Nizhne-Sinyachikhinsky plagiogranite massif, which is part of the Alapaevsk-Sukholozhsky zone, is promising for the Cu(Au,Mo)-porphyric mineralization type, were studied.
S. V. Pribavkin, A. V. Коrovko, I. A. Gottman   +2 more
doaj   +1 more source

Evidence for a reducing Archean ambient mantle and its effects on the carbon cycle [PDF]

, 2016
Chemical reduction-oxidation mechanisms within mantle rocks link to the terrestrial carbon cycle by influencing the depth at which magmas can form, their composition, and ultimately the chemistry of gases released into the atmosphere.
Aulbach, Sonja, Stagno, Vincenzo
core   +1 more source

Geological and geotechnical challenges on the Great Dyke of Zimbabwe and their impact on hardrock pillar design

Deep Underground Science and Engineering, EarlyView.
The Great Dyke of Zimbabwe is notable for its rich platinum group metal deposits but poses significant geological and geotechnical challenges due to its complex rock types and structural features. Traditional pillar design methods are insufficient for addressing these complexities; the study suggests incorporating advanced techniques such as machine ...
Tawanda Zvarivadza, Hendrik Grobler, Moshood Onifade, Manoj Khandelwal   +3 more
wiley   +1 more source

Real‐time lithology identification while drilling based on drill cuttings image analysis with ensemble learning

Deep Underground Science and Engineering, EarlyView.
A lithology identification while drilling method was developed, integrating an automated cuttings sampling system, a smart drilling rig, and an ensemble learning model. Underground trials achieved 97.42% accuracy in real‐time identification of cuttings lithology and composition, enhancing hazard management and supporting unmanned drilling technology in
Kun Li, Ting Ren, Ningping Yao, Jon Roberts, Haitao Song, Zhongbei Li, Xueqiu He, Liang Zhao   +7 more
wiley   +1 more source

The mineralogy, petrology, and composition of anomalous eucrite Emmaville [PDF]

, 2017
The Emmaville eucrite is a relatively poorly studied basaltic achondrite with an anomalous oxygen isotope signature. In this study, we report comprehensive mineralogical, petrographic, and geochemical data from Emmaville in order to understand its ...
Barrat, Barrat, Bland, Bogard, Bunch, Clayton, Cleverly, Eggins, Floss, Ghosh, Greenwood, Greenwood, Greenwood, Greenwood, Janots, Lodders, Mandler, Mason, Mayne, McSween, Metzler, Miller, Miller, Mittlefehldt, Mittlefehldt, Mittlefehldt, Morgan, Nyquist, Palme, Papike, Qin, Righter, Rogers, Scott, Spivak-Birndorf, Starkey, Stolper, Takeda, Takeda, Trinquier, Warren, Wasson, Weisberg, Wiechert, Yamaguchi, Yamaguchi, Yamaguchi, Yamaguchi   +47 more
core   +1 more source

The damage and failure mechanism of prestatically loaded rock during medium‐strain rate cyclic impact loading

Deep Underground Science and Engineering, EarlyView.
Based on experimental results and theoretical analysis, an established rock damage accumulation model that comprehensively considers the preapplied static load, impact peak value, impact frequency, and impact times. Abstract To study the rock damage mechanism under high static loading and superimposed medium strain rate cyclic impact loading, a series ...
Wei Wang, Hanpeng Wang, Zicheng Wang, Xinyuan Xie, Yunhao Wu, Jinhou Zhang, Dekang Sun   +6 more
wiley   +1 more source

An ion probe study of the sulphur isotopic composition of Fe-Ni sulphides in CM carbonaceous chondrites [PDF]

, 2004
From the Introduction: The CM chondrites have endured variable degrees of aqueous alteration [1] which has changed their original mineralogy. A detailed study of the petrology and mineralogy of the sulphides in a suite of increasingly aqueously altered ...
Bullock, E. S., Gounelle, M., Grady, M. M., McKeegan, K. D., Russell, S. S.   +4 more
core   +1 more source