Results 71 to 80 of about 23,492 (308)

Alkali‐halogen metasomatism of the CM carbonaceous chondrites

Meteoritics and Planetary Science, 2019
Meteorite Hills (MET) 01075 is unique among the CM carbonaceous chondrites in containing the feldspathoid mineral sodalite, and hence it may provide valuable evidence for a nebular or parent body process that has not been previously recorded by this ...
Martin R Lee, B. E. Cohen, A. King
semanticscholar   +1 more source

Metasomatites of medium and mafic composition from Nyaschevo massif (Ilmeny Mauntains, South Urals)

Литосфера, 2015
The results of the study of mediosiliceous and mafic metasomatites located in ultramafic and mafic rocks Nyaschevo massif presents in the paper. The texthural and structural features of these rocks allow to attribute them to tectonites - protomylonites and
E. V. Medvedeva, A. B. Nemov, V. A. Kotlyarov   +2 more
doaj   +2 more sources

The Temperature and Composition of the Mantle Sources of Martian Basalts

Geophysical Research Letters, 2023
The composition of basaltic melts in equilibrium with the mantle can be determined for several Martian meteorites and in‐situ rover analyses. We use the melting model MAGMARS to reproduce these primary melts and estimate the bulk composition and ...
Max Collinet, Ana‐Catalina Plesa, Thomas Ruedas, Sabrina Schwinger, Doris Breuer   +4 more
doaj   +1 more source

Accessory minerals: a provenancing tool for steatite quarries

Archaeometry, Volume 67, Issue 5, Page 1212-1229, October 2025.
Abstract Steatite has been a widely traded material across a range of archaeological contexts. Yet, challenges inherent to determining its provenance limits our understanding of the networks and mechanisms of its exchange. We present a robust new accessory mineral provenancing “fingerprint” method based their specific growth history.
Riia Chmielowski, Kamal Badreshany, Karen Milek   +2 more
wiley   +1 more source

Theoretical petrology [PDF]

, 1979
The central issues in petrology have remained remarkably unchanged in the last 50 years. In igneous petrology, the focus is on understanding the nature and cause of diversity in igneous rocks: on identifying primary magma types and constraints on the ...
Stolper, Edward
core   +1 more source

Deep Source Regions for Back‐Arc Volcanism in the Patagonian Slab Window Imaged by Finite Frequency P and SH Body Wave Tomography

Geophysical Research Letters, Volume 52, Issue 17, 16 September 2025.
Abstract The subduction of the Chile Ridge beneath South America beginning 12–16 Myr ago opened a gap in the subducting slab beneath southern Patagonia, which migrated northward and is located today at 46°S. Geodynamic processes associated with the slab window are poorly understood.
Walid Ben‐Mansour, Valerie Maupin, Douglas A. Wiens, Andreas Richter   +3 more
wiley   +1 more source

Phanerozoic Onset of Massive Continental Weathering

Geophysical Research Letters, Volume 52, Issue 17, 16 September 2025.
Abstract Continental weathering acts as a nexus of global biogeochemical cycles yet its long‐term evolution remains unclear. Here we show that continental weathering may not have operated on a massive scale until the early Paleozoic based on a large‐number data compilation of mudstone geochemistry.
Shenghui Ouyang, Junfeng Ji, Chao Li, Benjamin J. W. Mills, Guang‐Yi Wei, David W. Hedding, Gaojun Li   +6 more
wiley   +1 more source

KARAKTERISTIK PETROLOGI KOMPLEKS INTRUSI KECAMATAN CIKALONGKULON KABUPATEN CIANJUR JAWA BARAT

JGE
Penelitian tentang karakteristik batuan beku dapat berkontribusi pada penelitian lanjut tentang potensi sumber daya lainnya yang terkait dengan fenomena magmatisme, khususnya di lokasi yang memiliki sejarah magmatisme cukup panjang seperti di bagian ...
Fahmi Firmansyah, Rio Priandri Nugroho
doaj   +1 more source

Two-sided asymmetric subduction; implications for tectonomagmatic and metallogenic evolution of the Lut Block, Eastern Iran [PDF]

, 2011
West directed subduction zones show common characteristics, such as low structural elevation, deep trench, steep slab and a conjugate back-arc basin that are opposite to those of the east directed subduction zones.
Arjmandzadeh, R., Homam, S. M., Karimpour, M. H., Mazaheri, S. A., Medina, J. M., Santos, J. F.   +5 more
core   +2 more sources

Enhanced Continental Weathering Contributed to the Termination of the Middle Miocene Climatic Optimum

Geophysical Research Letters, Volume 52, Issue 17, 16 September 2025.
Abstract The Middle Miocene Climatic Optimum (MMCO, ca. 17.0 to 14.7 million years (Myr) ago) is a period of global warming that could be relevant to future projections for 2100 AD. However, the mechanism of atmospheric CO2 removal during this interval, particularly, whether silicate weathering is critically involved, is currently unclear.
Jiabin Wu, Licheng Guo, Shangfa Xiong, Shiling Yang, Xiaoxiao Yang, Yu Zhang, Man Zhang, Qiaowen Zhang, Jingyi Cui, Wenying Jiang, Bin Zhang   +10 more
wiley   +1 more source