Results 41 to 50 of about 944 (183)

Triassic magmatism and tectonic setting of Eastern Tianshan, NW China: constraints from the geochemistry and zircon U–Pb–Hf isotopes of granitoids in the Yamansu area

Frontiers in Earth Science, 2023
Introduction: To provide constraints on the Triassic tectonic setting of Eastern Tianshan, an integrated study was conducted on the geochronological and geochemical data for granodiorites, monzogranites, and two-mica granites from the Yamansu area on the
Hongming Cai, Hongming Cai, Hongming Cai, Xiangkuan Gong, Guiping Liu, Ruiqing Guo, Keyong Wang   +6 more
doaj   +1 more source

Petrogenesis and Tectonic Evolution of Cenozoic Magmatism in the Southernmost Northern Andes: Insights From Zircon Petrochronology

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 8, August 2026.
Abstract This study integrates new zircon U–Pb ages, zircon εHf(t)–δ18O isotopic data, and whole‐rock geochemistry to refine the temporal and spatial framework of magmatism in the southern Northern Andes (SNA) from ∼65 to 6 Ma. The San Lucas, Catamayo, Portachuela, and Gonzanamá batholiths and magmatic suites, along with Late Miocene plutons, display ...
J. Iglesias, C. Witt, L. C. Sandoval Espinel, M. Zattin, M. Poujol, O. Bruguier, O. Poma, M. J. Hernández, O. Averbuch, M. Seyler, D. Bosch, F. Chanier, S. Ventalon, C. Liorzou, V. Bosse   +14 more
wiley   +1 more source

Geochemical Characteristics of Paleoproterozoic Granites in the Rizhao Area, Shandong Province: Implications for the Breakup of the Columbia Supercontinent

Yankuang ceshi
The Rizhao area in Shandong Province lies on the northeastern margin of the Yangtze block, south of the Tanlu fault zone. It is a key region for investigating the breakup processes of the Columbia supercontinent.
Yaoyao ZHANG, Honglei ZHAN, Wei ZHU, Peng YANG, Benli GUO, Fangyuan JIANG, Xiaolong HE, Kai LIU   +7 more
doaj   +1 more source

Rare Earth Element Deposits of Alkaline Igneous Rocks

Resources, 2017
Alkaline igneous complexes host deposits of rare earth elements (REE), which represent one of the most economically important resources of heavy REE and Yttrium (Y).
Jaroslav Dostal
doaj   +1 more source

Geochronology and petrogeochemical characteristics of U-bearing granites in the Dongshang deposit, northwestern Jiangxi, China and its geological significance

Dizhi lixue xuebao, 2023
The Dongshang Uranium Deposit is situated in the southern section of the Ganfang Pluton in the Jiuling Orogenic Belt of northwestern Jiangxi Province. The U-bearing granites consist mainly of medium- to coarse-grained, porphyritic biotite(binary) granite.
DANG Feipeng, LYU Chuan, TANG Xiangsheng, ZHANG Yong, XIAO Zhibin, LI Zhipeng, TANG Junyang, ZHANG Tao   +7 more
doaj   +1 more source

Vanadium Isotopic Compositions of the High‐3He/4He Baffin Island Lavas

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 8, August 2026.
Abstract The isotopic composition of vanadium (V) in hotspot lavas provides new insight into the source of deep mantle heterogeneities. We measured V isotopic compositions in Paleogene Baffin Island lavas, which erupted above the Iceland plume head, to constrain the mantle plume source. These lavas have V isotopic compositions that are lighter (−0.96 ± 
Jonas Kaare‐Rasmussen, Forrest Horton, Maureen Auro, Andy W. Heard, Sune G. Nielsen   +4 more
wiley   +1 more source

Petrogenesis of metabasalt rocks in the Bulfat complex, Kurdistan region, Iraqi Zagros Suture Zone [PDF]

Kirkuk Journal of Science, 2015
Metabasaltes are exposed in the Bulfat complex north of Qaladeza that is a part of the Northwestern Zagros Suture Zone (NZSZ).Petrographic and geochemical study of metabasaltes have been conducted in order to provide insights into the origin and ...
Sarmad A. Ali
doaj   +1 more source

Nb-Zr enrichment in Jabal Al Bayda A-type granites, western Arabian Shield, Saudi Arabia: interplay of magmatic and hydrothermal processes

Journal of Taibah University for Science, 2022
Al Bayda’s younger granitic pluton located within the western Arabian Shield, Al Madinah area, KSA, has been studied using collaborative techniques. The collected samples were studied petrographically using a polarizing microscope and geochemically using
Sayed Mohamed Sakr, Abdullah Omar Bamousa, Ahmed Gad   +2 more
doaj   +1 more source

Automated Mineral Identification and Rock‐Type Classification of Lunar Mare Basalts Using SEM Images

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 4, August 2026.
Abstract We present an automated system for identifying minerals and classifying rock types in Apollo lunar mare basalts using scanning electron microscopy (SEM) imagery. Mineral segmentation is based on a U‐Net architecture, supplemented by two scale‐aware models designed to incorporate pixel size information.
Ji‐In Jung, Sonia M. Tikoo, Jaehong Chung, Claire I. O. Nichols   +3 more
wiley   +1 more source

Early–Late Carboniferous Tectonic Evolution of the Northern North China Craton (NE China): Constraints From Zircon Ages, Geochemistry, and Crustal Thickness Modeling

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 8, August 2026.
Abstract The tectonic evolution of the northern margin of the North China Craton (NCC) remains controversial. In this study, we obtained zircon U–Pb ages, geochemical data, and Sr–Nd isotopic data for volcanic rocks, and detrital zircon ages for sedimentary rocks from the Yufutun, Tongqigou, and Benxi formations in central‐southern Jilin Province, NE ...
Yunfei Chang, Qingxiang Du, Huachun Gan, Xiaoli Shen, Zuozhen Han, Xiaoxue Hou, Huicong Zhang   +6 more
wiley   +1 more source