Results 101 to 110 of about 2,710,958 (297)

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 late Paleozoic ecological-evolutionary laboratory, a land-plant fossil record perspective [PDF]

, 2014
In this essay we examine the fossil record of land plants, focusing on the late Paleozoic. We explore the nature of this record in terms of what is preserved, where, why and with what biases.
Kerp, Hans, Stratigraphy & paleontology, Duijnstee, Ivo, Looy, Cindy, DiMichele, Bill, Stratigraphy and paleontology   +5 more
core   +1 more source

Late Pleistocene Volcanic Rocks From Tengchong Volcanic Field at SE Tibetan Plateau: Constraints on Petrogenesis and Mantle and Crustal Processes

Geological Journal, EarlyView.
Early zircon saturation and crystallisation occur in mafic (52–54 wt.% SiO2) lavas at Tengchong volcanic field. These early formed zircons with high δ18O (6.6‰–7.9‰) indicates mantle enrichment by subducted supracrustal materials. ABSTRACT Late Pleistocene (< 0.2 Ma) mafic and evolved volcanic rocks occur in northern Tengchong Volcanic Field, SE ...
Lizhu Wang, Haibo Zou
wiley   +1 more source

Trans-Atlantic dinoflagellate cyst stratigraphy across the Cenomanian–Turonian (Cretaceous) Stage boundary [PDF]

Journal of Micropalaeontology, 2000
Abstract. The principal palynological proxy for the Cenomanian–Turonian Stage boundary, the top of consistent/common Litosphaeridium siphoniphorum (a dinoflagellate cyst), occurs in Greenhorn Bed 73 at the international stratotype section, west of Pueblo, Colorado, USA.
openaire   +2 more sources

A Reassessment of Petrochemistry of ~1.2 Ga Tonalitic Rocks of the Northern Tugela Terrane, Natal Metamorphic Belt, South Africa: Further Constraints on the Evolution of This Belt

Geological Journal, EarlyView.
Our petrochemical studies on ~1.2 Ga granitoids of the Natal Metamorphic Belt, South Africa, do not suggest any property similar to Phanerozoic‐style subduction‐related granitoids. Plot of Kotongweni Tonalite in Y versus Sr diagram (after Moyen 2011), note that most samples have Sr/Y < 50.
Palesa Leuta, Saumitra Misra, Thembiso O. Basupi   +2 more
wiley   +1 more source

Characteristics and evolutionary process of low-mature paleo-subsurface rivers in carbonate sequences and controls on hydrocarbon accumulation in the northern Tarim Basin, NW China

Frontiers in Earth Science
Paleo-subsurface rivers can serve as high-quality reservoir spaces for hydrocarbon accumulation within the carbonate sequence stratigraphy. However, the characteristics and evolutionary process of the typical low-mature paleo-subsurface rivers are rarely
Hongqi Dong, Hongqi Dong, Hongqi Dong, Bingshan Ma, Xiaoguo Wan, Jiapeng Liang, Jiapeng Liang, Bin Liang, Bin Liang, Qingyu Zhang, Qingyu Zhang, Meng Zhang, Meng Zhang, Guochen Mo, Guochen Mo   +14 more
doaj   +1 more source

A four stage evolution of the White Channel gravel: Implications for stratigraphy and palaeoclimates [PDF]

, 2014
Although the White Channel gravel (WCG) of the Klondike district, Yukon, contains gold placers\ud which have been exploited for over a century, few sedimentological studies have been undertaken.\ud This study reports a four stage evolution of the WCG, comprising:\ud i.
Lowther, Robert, Peakall, Jeff, Chapman, Robert, Pound, Matthew   +3 more
openaire  

Seismic Stratigraphy of a Circular Concave-Downward Structure, Chukchi Sea [PDF]

, 2017
A circular concave-downward structure (CCDS) and its structural features and seismic facies can be observed in several 2D seismic lines imaging the Chukchi Sea planning area. The area in question is largely underexplored and the data coverage is limited.
Ruiz Lozano, Andres Hernan
core  

Tectono‐Sedimentary Evolution of the Neogene İnegöl Basin (NW Anatolia): Constraints on Transtensional Basin Development at the Junction of the Western Anatolian Extensional Province and the North Anatolian Fault Zone

Geological Journal, EarlyView.
The study outlines the tectono‐sedimentary evolution of the İnegöl Basin in north‐western Anatolia. Basin formation was controlled by interacting extensional and strike‐slip fault systems linked to uplift of the Uludağ Massif. Terrestrial sedimentation from the Miocene to Pleistocene is reconstructed using abundant fossil mammal assemblages that ...
M. Cihat Alçiçek, Volkan Karabacak, Serdar Mayda   +2 more
wiley   +1 more source

Redefinition of the Ilerdian Stage (early Eocene)

Geologica Acta, 2009
The Ilerdian Stage was created by Hottinger and Schaub in 1960 to accommodate a significant phase in the evolution of larger foraminifera not recorded in the northern European basins, and has since been adopted by most researchers working on shallow ...
V. PUJALTE, J.I. BACETA CABALLERO, B. SCHMITZ, X. ORUE-ECHEBARRÍA, A. PAYROS AGIRRE, G. BERNAOLA BILBAO, E. APELLANIZ INGUNZA, F. CABALLERO SANTAMARIA, A. ROBADOR MORENO, J. SERRA KIEL, J. TOSQUELLA I ANGRILL   +10 more
doaj