Results 51 to 60 of about 48,565 (249)

Intermontane basins and bimodal volcanism at the onset of the Sveconorwegian Orogeny, southern Norway [PDF]

, 2014
This research was supported by the University of St Andrews and the Natural Environment Research Council Steering Committee (IMF458/0512 and IP-1326-0512).The greenschist-facies late Mesoproterozoic Bandak succession in southern Norway consists of ...
Roberts, Nick M.W., Roberts, N., Spencer, Christopher, Prave, Anthony R., Horstwood, Matthew S.A., Hawkesworth, C., Cawood, Peter A., Antonini, Afra S.M., Prave, A., Antonini, A., Hawkesworth, Chris J., Cawood, P., Horstwood, M., Spencer, Christopher J., Prave, Anthony R.; id_orcid   +14 more
core   +1 more source

Thermochronologic Constraints on the Extensional History of the Ibex Hills, Southeastern Black Mountains, Death Valley, California

Geological Journal, EarlyView.
A. Modeled T‐t paths for samples in the northern Ibex Hills, showing steady cooling throughout much of the Cenozoic, until rapid Miocene cooling. B. Weighted mean paths for each sample in this study. Note that all show a rapid cooling event at or just after 10 Ma, which is interpreted to represent exhumation as a result of regional extenstion ...
Zachariah D. Fleming
wiley   +1 more source

Notable Impact of Paleotectonic Stress on Gold Mineralisation in the West Qinling Orogen

Geological Journal, EarlyView.
By applying fuzzy clustering and multiple inverse methods, we systematically processed the data of vein and fault slip in this ore deposit to reveal the transition of orogenic geological environment and paleotectonic stress field. Our research results show two different stress states: the northwest–southeast extensional stress field and the northeast ...
Hongyan Wang, Aibing Chen, Jian Yang, Yuan Zhang   +3 more
wiley   +1 more source

Sr-Nd isotopic characteristic, U-Pb zircon geochronology, and petrogenesis of Najmabad Granodiorite batholith, Eastern Iran

Journal of Economic Geology, 2012
The study area is located south of Ghonabad in Eastern Iran. This area is situated between two major faults, Darouneh to the north and Dashtbyaz to the south. The movements of these faults cased major dislocation of this block.
Mehrab Moradi Noghondar, Mohammad Hassan Karimpour, G. Lang Farmer, Charles R. Stern   +3 more
doaj   +1 more source

Geochronology of the Suomenniemi rapakivi granite complex revisited: Implications of point-specific errors on zircon U-Pb and refined λ₈₇ on whole-rock Rb-Sr [PDF]

Bulletin of the Geological Society of Finland, 2015
Multi-grain isotope dilution and secondary ion microprobe zircon U-Pb as well as wholerock Rb-Sr isotope dilution data on the late Paleoproterozoic Suomenniemi rapakivi granite complex (exposed on the northern flank of the Wiborg batholith in ...
O.T. Rämö, I. Mänttäri
doaj   +1 more source

TIMS Techniques for Measuring Strontium Isotope Ratios in Apatite Grains and Application to Igneous Rock Petrology. [PDF]

Rapid Commun Mass Spectrom
ABSTRACT Rationale This study evaluates the potential of Sr isotopic compositions in apatite grains from magmatic rocks as a proxy for initial 87Sr/86Sr ratios, addressing the need for alternative approaches to conventional whole‐rock analyses in isotopic studies of granitoid systems.
Neto C, de Morisson Valeriano C, Paravidini G, Bruno H, Carvalho M, Almeida R, Peixoto C, Bersan S, Carvalho M, Heilbron M.   +9 more
europepmc   +2 more sources

Bias in detrital zircon geochronology and thermochronometry [PDF]

, 2013
Detrital studies that utilise zircon U-Pb geochronology and fission-track (FT) thermochronometry are subject to a range of potential sources of bias that should be properly evaluated and minimised.
Garzanti, Eduardo, Malusà, M.G., Malusà, Marco G., Carter, Andrew, Limoncelli, M., Garzanti, E., Villa, Igor Maria, Villa, I.M., Limoncelli, Marta   +8 more
core   +1 more source

Geochemistry and Geochronology of Magmatic Rocks in Southwestern and Northeastern Cambodia: Implications for the Tectonic Evolution and Metallogenesis of the Loei Fold Belt

Geological Journal, EarlyView.
The composition of intrusive rocks suggests that the magma was likely generated in a subduction‐related setting. The arc crustal thickness in the Phnom Sro Ngam and Halo Prospects was probably < 40 km during emplacement. Zircon U–Pb age range indicates a correlation with Loei Fold Belt magmatic activity.
Sirisokha Seang, Khin Zaw, Kakda Kret, Ivan Belousov, Kotaro Yonezu, Koichiro Watanabe, Charles Makoundi   +6 more
wiley   +1 more source

The nature of zircon in the Volkovsky massif gabbro (Middle Urals): the age problem and geochronological consequences

Литосфера, 2017
The article presents new isotope-geochemical data on zircon from gabbronorites of the Volkovsky massif in the Middle Urals. The massif is a complex combination of different rock associations - from ultramafic rocks to syenites and quartz diorites, whose ...
Elena V. Anikina, Artur A. Krasnobaev, Evgenii V. Pushkarev, Igor’ A. Rusin   +3 more
doaj   +1 more source

Pre-1.91 Ga deformation and metamorphism in the Palaeoproterozoic Vammala Migmatite Belt, southern Finland, and implications for Svecofennian tectonics [PDF]

Bulletin of the Geological Society of Finland, 2004
A metamorphic event in the Vammala Migmatite Belt (VMB) at ~1.92 Ga, revealed by SHRIMP U-Pb analyses of both zircon overgrowths and monazite, is interpreted as post-depositional and is correlated with the development of the early high-grade schistosity.
R.W.R. Rutland, I.S. Williams, K. Korsman   +2 more
doaj   +1 more source