نتایج جستجو برای: orogenic
تعداد نتایج: 1668 فیلتر نتایج به سال:
The Western Qinling orogenic belt (WQOB) is one of the most important prospective gold districts in China, with widely distributed Indosinian intermediate–acidic intrusions. Liziyuan Au deposit a representative northern WQOB, hosting several sections spatially associated igneous rocks. hosted by meta-sedimentary volcanic rocks Cambrian–Ordovician Group and Tianzishan monzogranite. Two periods, ...
The Cenozoic sedimentary cover of the Malaguide Complex (Internal Betic Cordillera, Spain), in Almería and Málaga areas, consists a suite successions from continental shallow-marine to deep-marine environments. Structural stratigraphic relations, petrological geochemical signatures reveal evolution (CMC) pre-orogenic (Palocene-Eocene) syn-orogenic (Oligocene-Early Miocene) stages. Sandstones de...
The East Kunlun Orogenic Belt is considered as one of the important gold mineralization regions in Tethys tectonic domain. These orogenic deposits are related to intermediate-acid intrusions formed at end Paleo-Tethys evolution, but petrogenesis controversial. This paper presents a new study on geochemistry zircon U-Pb, O, S, and Pb isotopic compositions Asiha quartz diorite, granite porphyry, ...
Abstract Orogenic belts have been thought to form through plate convergence, involving subduction of oceanic lithosphere at continental margins (accretionary orogens), which may ultimately lead ocean closure and continent-continent collision (collisional orogens). Intraplate orogens away from known, but the mechanisms controlling their evolution are poorly understood. The South China craton, in...
In the mid‐1980s, advances in understanding the mechanics of the fold‐and‐thrust belts that flank many collisional mountain ranges set the stage for a fundamental change in our appreciation of the role of erosion in the tectonic evolution of mountain ranges. A combination of sandbox experiments, analytical treatments of stress state and field observations showed that fold‐and‐thrust belts form ...
The Lachlan Fold Belt is well known for its complex deformational history, with a number of orogenic events and associated structural styles recognised. Recent syntheses of this orogenic evolution have emphasised the difficulty of identifying fold-belt-wide deformational episodes and have inferred the existence of diachronous deformation zones with an overall merging of episodic orogenic events...
State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China. Collaborative Innovation Center of Quantum Matter, Beijing 100871, China. Ministry of Education Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China. Department of Chemical and Biolo...
The flora of Mexico includes about 119 endemic or nearly endemic genera of Asteraceae. In this study, the genera are listed and their distribution patterns among the floristic provinces of Mexico analyzed. Results indicate strong affinities of the endemic genera for mountainous and arid or semiarid regions. Since its first appearance in Mexico, the Asteraceae diversified into these kinds of hab...
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