Results 211 to 220 of about 29,296 (274)

Neoproterozoic magmatism in eastern Himalayan terrane

Science Bulletin, 2017
Geochronological investigation on gneisses of granitic to leucogranitic compositions in Cuona, south Tibet, reveal that their protoliths formed at 808.8±7.9-816.4±3.4Ma and 855.8±7.0Ma, respectively. Zircon rims from the granitic gneiss record a metamorphic age of 739.4±4.3Ma.
Yuhua, Wang, Lingsen, Zeng, Li-E, Gao, Chunli, Guo, Kejun, Hou, Lifei, Zhang, Wei, Wang, Huiyi, Sun   +7 more
openaire   +2 more sources

 Distribution and significance of pre-Neoproterozoic zircons in juvenile Neoproterozoic igneous rocks of the Arabian-Nubian Shield

American Journal of Science, 2010
Igneous rocks of the Arabian-Nubian Shield (ANS) have lithologic associations (ophiolites, calc-alkaline igneous rocks, immature sediments) and radio- genic isotopic compositions consistent with formation as juvenile continental crust as a result of accreting intraoceanic arc systems during 880 to 630 Ma, with crustal differentiation continuing until ...
Stern, R.J, Ali, K.A, Liégeois, Jean-Paul, Johnson, Paul, Wiescek, F., Kattan, F.   +5 more
openaire   +2 more sources

Neoproterozoic magmatic and metamorphic events in the Cuchilla Dionisio Terrane, Uruguay, and possible correlations across the South Atlantic

Precambrian Research, 2019
The Cuchilla Dionisio (or Punta del Este) Terrane of the southern Dom Feliciano Belt, eastern Uruguay, experienced a prolonged Neoproterozoic to Cambrian tectonothermal evolution.
T. Will, C. Gaucher, Xiaoxiao Ling, Xian‐Hua Li, Qiu‐Huan Li, H. Frimmel   +5 more
semanticscholar   +1 more source

The Neoproterozoic supercontinent Palaeopangaea

Gondwana Research, 2007
Abstract The Rodinia hypothesis for the Neoproterozoic Supercontinent reconstruction is associated with five major problems: (i) The palaeomagnetic test requires continental break-up hundreds of millions of years before the geological evidence for this event is recognised near the dawn of the Cambrian.
openaire   +1 more source

Early Neoproterozoic gneissic granitoids in the southern Yili Block (NW China): Constraints on microcontinent provenance and assembly in the SW Central Asian Orogenic Belt

Precambrian Research, 2019
The Central Asian Orogenic Belt (CAOB) was built by amalgamation of diverse geologic units including several microcontinents. The nature and geodynamic evolution of the Precambrian basement of these units are essential to constrain their origin, and thus
Xiaoyan Zhu, Bo Wang, Dominique Cluzel, Zhiyuan He, Yongheng Zhou, L. Zhong   +5 more
semanticscholar   +1 more source

Contributions to the Neoproterozoic Geobiology

2014
Ph. D.
openaire   +2 more sources

The Neoproterozoic glacial broom

Geology
Abstract Neoproterozoic snowball Earth events reflect globally frigid conditions thought to have stimulated changes in geochemical cycling with planetary biotic response. We investigated the impact of these events on sediment dynamics, focusing on the detrital zircon record within the Dalradian Supergroup of Scotland and Ireland ...
C.L. Kirkland, R.A. Strachan, D.B. Archibald, J.B. Murphy   +3 more
openaire   +1 more source

Provenance of latest Mesoproterozoic to early Neoproterozoic (meta)-sedimentary rocks and implications for paleographic reconstruction of the Yili Block

Gondwana Research, 2019
The Yili Block is one of the major Precambrian microcontinents of the Central Asian Orogenic Belt (CAOB). Detrital zircon U-Pb ages and Hf isotopic data of the Meso-Neoproterozoic (meta)-sedimentary units within the Yili Block constrain the tectonic ...
Hu Huang, Peter A. Cawood, Mingcai Hou, Fuhao Xiong, S. Ni, Tingting Gong   +5 more
semanticscholar   +1 more source

A Neoproterozoic Chronology

2007
Galen P ...
openaire   +1 more source

Neoproterozoic glaciation in the Earth System

Journal of the Geological Society, 2007
The Neoproterozoic contains severe glacial intervals (750–580 Ma) including two extending to low palaeomagnetic latitudes. Paucity of radiometric dates indicates the need for chronostratigraphic tools. Whereas the marine 87 Sr/ 86 Sr signatures show a steady rise, δ 13
Fairchild, I., Kennedy, M.
openaire   +2 more sources