Zobrazeno 1 - 10
of 124
pro vyhledávání: '"Tim E. Johnson"'
Autor:
Hamed Gamaleldien, Kun Wang, Tim E. Johnson, Jian-Feng Ma, Mohamed Abu Anbar, Xinmu J. Zhang, Hugo K.H. Olierook, Christopher L. Kirkland
Publikováno v:
Geoscience Frontiers, Vol 15, Iss 6, Pp 101882- (2024)
Constraining the processes associated with the formation of new (juvenile) continental crust from mantle-derived (basaltic) sources is key to understanding the origin and evolution of Earth’s landmasses. Here we present high-precision measurements
Externí odkaz:
https://doaj.org/article/1f889f6a346641c29180abb654e4f647
Autor:
Bo Huang, Man Liu, Timothy M. Kusky, Tim E. Johnson, Simon A. Wilde, Dong Fu, Hao Deng, Qunye Qian
Publikováno v:
Nature Communications, Vol 14, Iss 1, Pp 1-14 (2023)
Abstract The Earth’s interior and surficial systems underwent dramatic changes during the Paleoproterozoic, but the interaction between them remains poorly understood. Rocks deposited in orogenic foreland basins retain a record of the near surface
Externí odkaz:
https://doaj.org/article/68976663793646629fb5a44a182ad736
Publikováno v:
Nature Communications, Vol 13, Iss 1, Pp 1-13 (2022)
This study reports coexisting Neoarchean divergent and convergent plate boundary rock assemblages, providing new evidence for the operation of plate tectonics 2.55–2.51 billion years ago; and also suggests the subduction zone was warm then.
Externí odkaz:
https://doaj.org/article/756af53ffaa24b709fa5f7346f4e6dc0
Autor:
Robert H. Smithies, Yongjun Lu, Tim E. Johnson, Christopher L. Kirkland, Kevin F. Cassidy, David C. Champion, David R. Mole, Ivan Zibra, Klaus Gessner, Jyotindra Sapkota, Matthew C. De Paoli, Marc Poujol
Publikováno v:
Nature Communications, Vol 10, Iss 1, Pp 1-12 (2019)
Some of Earth’s earliest continental crust has been previously inferred to have formed from partial melting of hydrated mafic crust at pressures above 1.5 GPa (more than 50 km deep), pressures typically not reached in post-Archean continental crust
Externí odkaz:
https://doaj.org/article/7ec8b46796a14bc88ba5c9941ac2f6c4
Autor:
Eleanore Blereau, Tim E. Johnson, Chris Clark, Richard J.M. Taylor, Peter D. Kinny, Martin Hand
Publikováno v:
Geoscience Frontiers, Vol 8, Iss 1, Pp 1-14 (2017)
The Rogaland–Vest Agder Sector of southwestern Norway comprises high-grade metamorphic rocks intruded by voluminous plutonic bodies that include the ∼1000 km2 Rogaland Igneous Complex (RIC). New petrographic observations and thermodynamic phase e
Externí odkaz:
https://doaj.org/article/11300e5478db4de9a1860a144bc553d1
Publikováno v:
Geoscience Frontiers, Vol 6, Iss 3, Pp 373-387 (2015)
Data from a migmatised metapelite raft enclosed within charnockite provide quantitative constraints on the pressure–temperature–time (P–T–t) evolution of the Nagercoil Block at the southernmost tip of peninsular India. An inferred peak metamo
Externí odkaz:
https://doaj.org/article/1ece39830cd1414ba13a8b64f3b2a713
Autor:
Tim E. Johnson, Christopher L. Kirkland, Yongjun Lu, R. Hugh Smithies, Michael Brown, Michael I. H. Hartnady
Publikováno v:
Nature. 608:330-335
Publikováno v:
Journal of Petrology. 64
The bulk rock composition of granitoids reflects the composition of their source and the conditions of partial melting, which are functions of the geodynamic setting in which they formed. Granitoids in active continental margins (continental arcs) ar
Autor:
Songjie Wang, Michael Brown, Lu Wang, Tim E. Johnson, Hugo K.H. Olierook, Christopher L. Kirkland, Andrew Kylander-Clark, Noreen J. Evans, Bradley J. McDonald
Publikováno v:
GSA Bulletin. 135:48-66
The rates and mechanisms by which deeply subducted continental crust was exhumed back to the surface are not well understood, but can be better characterized using multimineral petrochronology. Here, we combine zircon, titanite, and apatite U-Pb ages
Publikováno v:
Geology. 50:631-635
Since the Jurassic, there has been a clear spatiotemporal correlation between different types of metamorphism and active convergent plate margins. However, the extent to which this relationship extends into the past is poorly understood. We compared