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Papers 5636
1 page of 564 pages (5,636 results)
Published on Jul 1, 2019in Lithos 3.91
Rohit Pandey2
Estimated H-index: 2
(BHU: Banaras Hindu University),
Ashutosh N. Pandey12
Estimated H-index: 12
(BHU: Banaras Hindu University)
+ 5 AuthorsPrashant Dhote Dhote (Kuwait Oil Company)
Abstract We present petrology, geochemistry and radiogenic isotope (Sr and Nd) data of thirteen post-Deccan lamprophyre dykes in the Narmada rift zone from the Chhotaudepur alkaline province of the Deccan Large Igneous Province (DLIP). Mineralogically, these dykes show affinity towards alkaline (sannaite and camptonite) as well as ultramafic (damtjernite) varieties of lamprophyres. Their major oxides and certain trace element ratios increase with increasing silica content highlighting the strong...
Published in Lithos 3.91
Sanni T. Turunen (AMNH: American Museum of Natural History), Arto V. Luttinen6
Estimated H-index: 6
(AMNH: American Museum of Natural History)
+ -3 AuthorsDaúd Liace Jamal3
Estimated H-index: 3
(UEM: Eduardo Mondlane University)
Abstract We present geochemical and isotopic (Nd, Sr) data for a picrite lava suite from the Luenha River and adjacent areas in Mozambique. The Luenha picrites represent a previously unknown type of picrites related to the Karoo large igneous province (LIP) and are distinguished by their notably low TiO2 contents (0.3–1.0 wt%) and coupling of high Nb/Y with low Zr/Y and Sm/Yb. Relatively high CaO and low Zn/Fe point to a peridotitic mantle source. Contamination-sensitive incompatible element rat...
Published in Lithos 3.91
Allen P. Nutman58
Estimated H-index: 58
(UNSW: University of New South Wales),
Clark R.L. Friend35
Estimated H-index: 35
+ -3 AuthorsAllan R. Chivas50
Estimated H-index: 50
(University of Adelaide)
Abstract The rare preservation of a stratigraphy in the northwest of the Eoarchean Isua supracrustal belt (Greenland) demonstrates the world's earliest-recognised marine transgression. Stratigraphically lowest is the ~3710 Ma Solvang Volcanic Formation of picrites, basalts and basaltic-andesites with juvenile-arc geochemical signatures. Close to its erosional top, this formation's volcanic rocks show increase in K2O with depletion of Na2O, depletion in Sr with no alteration in Eu abundance and δ...
Published on Jul 1, 2019in Lithos 3.91
Takashi Sano , Shigeru Yamashita (Okayama University)
Abstract A continuous section through an 811 m-thick lava pile of mid-ocean ridge basalts at Integrated Ocean Drilling Program Site 1256 provides important constraints on the variation with depth of volatile element (H 2 O, CO 2 , S and Cl) contents in fresh matrix glasses to understand evolution of magma, condition of magma ascent, and degree of hydrothermal assimilation. The lava pile is divided into two groups based on eruption location: off-axis basalts of upper portion (250–534 m beneath se...
Published in Lithos 3.91
Robert C. Newton56
Estimated H-index: 56
(UCLA: University of California, Los Angeles),
Leonid Y. Aranovich6
Estimated H-index: 6
(RAS: Russian Academy of Sciences),
Jacques L. R. Touret22
Estimated H-index: 22
Abstract The complementary roles of granites and rocks of the granulite facies have long been a key issue in models of the evolution of the continental crust. “Dehydration melting”, or fluid-absent melting of a lower crust containing H2O only in the small amounts present in biotite and amphibole, has raised problems of excessively high temperatures and restricted amounts of granite production, factors seemingly incapable of explaining voluminous bodies of granite like the Archean Closepet Granit...
Published in Lithos 3.91
Zezhong Zhang (Northwest University (United States)), Jiang-Feng Qin12
Estimated H-index: 12
(Northwest University (United States))
+ -3 AuthorsFangyi Zhang (Northwest University (United States))
Abstract Contemporaneous alkaline and gabbroic intrusions are commonly observed around high-Ti basalt in the inner zone of Emeishan large igneous province (ELIP), the distribution and origin of these igneous rocks are significant to understand the process associated with a head of Emeishan mantle plume activity. In this study, we present detailed petrology, chronology, major and trace element geochemistry, whole rock Sr Nd isotopes and zircon Hf isotopes for quartz syenite and hornblende gabbro ...
Published in Lithos 3.91
N.D. Chapman (UTAS: University of Tasmania), M Ferguson (UTAS: University of Tasmania)+ -3 AuthorsKathy Ehrig13
Estimated H-index: 13
Abstract The 1595–1575 Ma Hiltaba Suite intrusives and coeval Gawler Range Volcanics (GRV) represent a significant crustal component of the Mesoarchean-Mesoproterozoic Gawler Craton, South Australia, and one of the largest silicic igneous provinces in the world. They are also spatially and temporally-affiliated with world-class IOCG mineral deposits (i.e. Olympic Dam) thus making an understanding of these rocks important both economically, and petrologically. Here, we present the results of 177 ...
Published on Jul 1, 2019in Lithos 3.91
Rosana Silveira Resende1
Estimated H-index: 1
(UNESP: Sao Paulo State University),
Carlos Alberto Tello Saenz5
Estimated H-index: 5
(UNESP: Sao Paulo State University)
+ 1 AuthorsElton Luiz Dantas25
Estimated H-index: 25
(UnB: University of Brasília)
Abstract Understanding the chemical etching effects in the crystalline structure of zircon grains is crucial to know their chemical composition, morphology and isotopic geochemistry. After chemical etching, the zircon grain can be classified as homogeneous heterogeneous, hybrid and anomalous depending on the surface fission-track density observed under an optical microscope. The complementary techniques such as optical microscopy, micro-Raman spectroscopy, scanning electron microscopy (imaging b...
Published in Lithos 3.91
Hossein Azizi12
Estimated H-index: 12
(UKH: University of Kurdistan Hewler),
Robert J. Stern70
Estimated H-index: 70
(UTD: University of Texas at Dallas)
+ -3 AuthorsHadi Shafaii Moghadam16
Estimated H-index: 16
Abstract Late Paleocene adakitic granitoids are rare in Iran except in the northwest. We focused on the adakitic Saqqez-Takab pluton, which occupies an area of ~600 km2. New U-Pb zircon dating yield crystallization ages of 58–56 Ma (Thanetian). These granitoids comprises granite, quartz monzonite and monzogranite with granular to mylonitic textures. They have high SiO2 abundances (59.1–78.6 wt%), high ratios of Sr/Y (50–490) and La/Yb ratios (19–237), along with high Ba (779–2466 ppm) and light ...
Published on Jul 1, 2019in Lithos 3.91
Sergey V. Khromykh (NSU: Novosibirsk State University), A.E. Izokh14
Estimated H-index: 14
(NSU: Novosibirsk State University)
+ 3 AuthorsAndrey V. Vishnevsky (NSU: Novosibirsk State University)
Abstract New data of petrography, mineralogy, and geochemistry from the Irtysh shear zone in Eastern Kazakhstan reveal three types of gabbro: (1) dolerite and gabbrodolerite, (2) biotite-bearing gabbronorite and gabbrodiorite, and (3) layered peridotite-gabbro intrusions. Rocks of types 1 and 2 occur mainly as small bodies and share similarity in major- and trace-element compositions. Layered gabbro (type 3) forms the largest intrusion in the area and has a different composition: higher CaO and ...