Results 61 to 70 of about 724,346 (300)

Organic Reactivity Matters for the Emergence of Life: Kinetic Barriers and Molecular Diversity Are Suggested as Crucial Factors by Emerging Autonomous System Models

ChemSystemsChem, EarlyView.
Self‐organisation may result from organic systems fed with free energy provided that reactivity becomes a determining factor. The propensity of carbon to form covalent bonds can give rise to kinetically stable thermodynamically activated compounds possibly undergoing non‐linear kinetic processes.
Robert Pascal
wiley   +1 more source

First discovery of highly fractionated tourmaline-bearing leucogranite-pegmatite in Duxiushan, Anqing ore-cluster region, middle and lower Yangtze metallogenic belt: A clue to strategic metal exploration

Solid Earth Sciences, 2022
A suite of highly fractionated granites and associated pegmatite, were revealed through drill hole in the Anqing ore-cluster region in the Lower Yangtze River Belt (MLRB), Eastern China, for the first time. The pegmatite has abundant tourmaline.
Zhuang Zhao, Xiaoyong Yang, Beicai Zhang, Dongqing Wang, Jiancheng Xie, Tuyan Zhang, Wanying Li   +6 more
doaj  

Petrology, geochemistry and petrogenesis of volcanic band rocks in North of Tabriz, NW Iran [PDF]

پترولوژی, 2017
The studied volcanic rocks are located in 35 km North West of Tabriz and consists of dacite, andesite, basalt and basaltic andesite. Based on structural geology evidences, this area is part of west Alborz – Azerbaijan zone. Plio - Quaternary volcanism is
Mahdiyeh Fazelihagh, Nasir Amel, Ahmad Jahangiri   +2 more
doaj   +1 more source

Tracking Bronze Age ‘itinerant smiths’ in western Poland: insights from Nd and Sr isotope data

Archaeometry, EarlyView.
Abstract The neodymium (Nd) isotope composition of stone casting moulds found in graves of Bronze Age ‘itinerant smiths’ in western Poland was analysed to determine the provenance of their raw materials. For the first time in archaeological research, the Nd model age (TDM)—a highly useful parameter in studying the provenance of geological materials—has
Mateusz Stróżyk, Łukasz Pospieszny, Zdzislaw Belka, Aldona Garbacz‐Klempka, Patrycja Silska, Marta Wardas‐Lasoń   +5 more
wiley   +1 more source

Occurrence of niobium in biotite-type Fe-REE-Nb ore in the Bayan Obo deposit

Solid Earth Sciences, 2023
The Bayan Obo REE-Nb-Fe deposit, which reserves the current largest REE resources globally, also hosts 63.4% of China's Nb resources. Previous studies mainly focus on the isotopes and petrographic mineralogy of carbonatite dyke, ore-host dolomite and ...
Yisu Ren, Xiaoyong Yang, Xiaoxia Wang
doaj  

Gravity inversion of deep-crust and mantle interfaces in the Three Gorges area

Geodesy and Geodynamics, 2012
To better understand the heterogeneity of deep-crust and mantle interfaces in the region of the Three Gorges, China, we used the Parker-Oldenburg iterative inversion method to invert existing Bouguer gravity data from the Three Gorges area (1 : 500000 ...
Wang Jian, Shen Chongyang, Ii Hui, Sun Shaoan, Xing Lelin   +4 more
doaj   +1 more source

De Geer moraine internal architecture based on sedimentological and geophysical investigations and implications for ice‐marginal reconstructions

Boreas, EarlyView.
De Geer moraines may act as valuable ice‐marginal indicators; however, to date, their variable mode of formation has presented challenges for this utility. Here, we present sedimentological and ground penetrating radar data of DGMs located in southwest Finland.
Gwyneth E. Rivers, Robert D. Storrar, Antti E. K. Ojala, Joni Mäkinen, Camilla Holmroos, Naomi Holmes   +5 more
wiley   +1 more source

Geological characteristics and metallogenic age of Tengshan'ao Sn deposit in Dayishan of South Hunan and its prospecting significance

Solid Earth Sciences, 2021
The Tengshan'ao Sn deposit, located at the Dayishan ore field, Nanling Range, is one of the recently explored deposits in this region. In this study, LA-MC-ICP-MS cassiterite U–Pb and muscovite 40Ar-39Ar isotopic dating analyses for altered granite-type ...
Zunzun Zhang, Yongyun Ning, Youyue Lu, Jingya Cao, Jianming Fu, Zhuang Zhao, Jian Guo, Liyan Ma, Zhengwei Qin, Jianfeng Li   +9 more
doaj  

Isotopic composition of lead from dikes and ores of the Vorontsovkoe gold deposit (Northern Urals)

Литосфера, 2020
Research subject. The Vorontsovskoe deposit belongs to gold deposits, in which gold is disseminated finely across carbonate-terrigenous rocks (Carlin-type). This study was aimed at identifying the sources of lead in various ore types (in skarn, jasperoid,
V. V. Murzin, I. V. Vikentyev, O. B. Azovskova, M. Yu. Rovnushkin, M. V. Streletskaya, V. I. Blokov, O. V. Vikent’eva   +6 more
doaj   +1 more source

Comments on ‘Late Middle Pleistocene Wolstonian Stage (MIS 6) glaciation in lowland Britain and its North Sea regional equivalents – a review’

Boreas, EarlyView.
Divergent views debated over the past 20 years on the Wolstonian depositional record of Fenland and the Peterborough area have centred on whether there is evidence of a single (middle or late) glaciation or of both a middle and a late glaciation. A recent review promoted a single late Wolstonian glaciation, despite there being incontrovertible evidence
Harry E. Langford
wiley   +1 more source