Partition geochemistry of hydrothermal precipitates from submarine hydrothermal fields in the Hellenic Volcanic Island Arc

2014 ◽  
Vol 52 (11) ◽  
pp. 992-1010 ◽  
Author(s):  
P. Megalovasilis
Keyword(s):  
Island Arc ◽  
Volcanic Island ◽  
Hydrothermal Fields

Observations in the South Sandwich Islands, 1962

Polar Record ◽  
1963 ◽  
Vol 11 (73) ◽  
pp. 394-405 ◽  
Author(s):  
M. W. Holdgate
Keyword(s):  
Island Arc ◽  
Deep South ◽  
Volcanic Island ◽  
The South ◽  
The West ◽  
Antarctic Region ◽  
South Sandwich Islands ◽  
Scotia Arc ◽  
The Antarctic ◽  
North And South

The South Sandwich Islands lie between lats. 56° 18′ S. and 59° 28′ S., and between longs. 26° 14′ W., and 28° 11′ W. There are eleven islands, of which ten form a curved chain stretching north and south while the eleventh, Leskov Island, lies to the west of the group near its northern end. The group is the only typical volcanic island arc in the Antarctic region and forms the easternmost section of the Scotia Arc; to the east it is bounded by the associated deep South Sandwich Trench.

scholarly journals PENENTUAN PROVENANCE SATUAN BATUPASIR FORMASI NANGGULAN DENGAN MENGGUNAKAN METODE DICKINSON (1985)

2018 ◽  
Vol 2 (1) ◽  
pp. 25
Author(s):  
Yohanes Arifin De Sousa
Keyword(s):  
Island Arc ◽  
Volcanic Island

Daerah penelitian secara administratif terletak di daerah Kalisongo, Kecamatan Nanggulan, Kabupaten Kulon Progo. Penelitian ini bertujuan untuk mengetahui keadaan geologi seperti provenance, iklim, relief dan kemiringan satuan batupasir Formasi Nanggulan, mengacu pada beberapa ahli seperti Dickinson (1985)Metode penelitian yang digunakan adalah pemetaan geologi permukaan yang meliputi beberapa tahapan, yaitu tahap pra-lapangan, tahap pemetaan geologi permukaan, tahap analisis laboratorium, dan tahap penyusunan laporan. Dari beberapa data diatas dilakukan analisis  provenance dengan menggunakan mineral kuarsa, feldspar dan fragmen batuan atau lithic yang di plotkan dalam segitiga QFL.Berdasarkan hasil pengeplotan mineral penyusun batuan dari Formasi Nanggulan bahwa kedudukan umum tektonik daerah asal batuan adalah Transition Arc (Volcanic Island Arc), Sedangkan batuan asalnya besaral dari pencampuran antara batuan plutonik, batuan vulkanik maupun batuan piroklastik. Dan juga iklim, topografi dan kemiringan daerah asal batuan yaitu beriklim panas dan lembab, sedangkan bentuk topografi dan kemiringan asal batuan yaitu sedang-curam, dilihat dari bentuk mineral kuarsa dan fragmen.Kata Kunci: Provenance, Formasi Nanggulan, Metode Dickinson (1985)

scholarly journals Chau Thoi and Nui Gio volcanic rocks: A remnant of the Loei Phetchabun volcanic belt in Viet Nam

2021 ◽  
Vol 24 (1) ◽  
pp. 1879-1888
Author(s):  
Tuan Anh Nguyen ◽  
Doan Thi Thuy ◽  
Ngo Tran Thien Quy ◽  
Lan Ching Yin
Keyword(s):  
Earth Science ◽  
Volcanic Rocks ◽  
Volcanic Belt ◽  
Major Elements ◽  
Island Arc ◽  
Geochemical Data ◽  
Viet Nam ◽  
Volcanic Island ◽  
Current Time ◽  
Continental Plate

Introduction: Extrusive volcanic rocks, such as dacite, andesite, basalto-andesite, basalt… of Chau Thoi and Nui Gio hills in Bien Hoa and Binh Phuoc provinces, southern Viet Nam, characterize volcanic island arc rocks. These rock suites formed as the convergent tectonic between the Indochina and Sibumasu geological blocks. Methods: Geochemical data of rock samples collected on the field were examined and analyzed by the Academia Sinica I E S (Institute of Earth Science, Taiwan and processed with a GCD kit (Geochemical Data Toolkit) to ascertain their characteristics and geotectonic setting. Result: Geochemical data both in major elements and trace elements of the Chau Thoi – Nui Gioshow a specific characteristic of a volcanic island arc environment. Discussion: Chau Thoi and Nui Gio rocks are suitable to correlate to the Permian Thailand Loei Phetchabun volcanic belt. However, at the current time, Chau Thoi and Nui Gio rocks have been classified as Deo Bao Loc formation - late Jurassic to early Cretaceous in ages - belong Truong Son magmatic belt. This magmatic belt resulted from the Yanshanian orogeny by the subduction of the Paleo-Pacific oceanic plate beneath the Eurasia (Indochina) continental plate. More studies needed to be performed, specially geochronological data to support the study. Conclusion: Chau Thoi and Nui Gio rock suites characterize volcanic island arc rocks, products of a convergence tectonic between Indochina and Sibumasu blocks. They are remnants of the Thailand Loei Phetchabun volcanic belt, the first time reported in Vietnam.

The Thores volcanic island arc of the Pearya Terrane from Ellesmere Island formed on Precambrian continental crust

2021 ◽  
Author(s):  
Jarosław Majka ◽  
Karolina Kośmińska ◽  
Jakub Bazarnik ◽  
William C. McClelland
Keyword(s):  
Continental Crust ◽  
High Arctic ◽  
Sensu Stricto ◽  
Ellesmere Island ◽  
Island Arc ◽  
Fault System ◽  
Published Data ◽  
Island Arcs ◽  
Volcanic Island ◽  
National Science

<p>We report on U-Pb zircon dating and bulk rock geochemistry results of intermediate to felsic rocks of the Thores Suite of the Pearya Terrane, northern Ellesmere Island (Arctic Canada).  Our new results together with the previously published data show that the Thores Suite was formed in the Early Ordovician (c. 490-470 Ma) as a part of an island arc. Some of the dated samples revealed common xenocrystic zircon. The latter yielded ages ranging between c. 2690 Ma and c. 520 Ma. The obtained ages of xenocrystic zircon are interpreted to be typical of Laurentia. We propose that the youngest obtained cluster of ages c. 580-570 Ma expresses a component typical for the Timanide Orogen, which is conventionally tied to Baltica. The newdataset sheds light on the history and understanding of the Thores Suite, which used to be explained as an effect of the M’Clintock orogenesis. The latter event was commonly presented as foreign to the major Caledonian orogenesis sensu stricto. In our view, the Thores Suite represents an island arc, which was formed on a fragment of continental crust dismembered during Iapetus opening. Importantly, the age of the Thores island arc is coeval with other island arcs and high pressure metamorphic units of the Scandinavian and Svalbard Caledonides. Thus, it is likely that the Thores volcanic island arc was a part of the larger arc system operating within northern Iapetus. The juxtaposition of the Thores arc with the other successions of the Pearya Terrane is ascribed to a major sinistral strike-slip escape fault-system developed along the northeastern margins of Baltica and Laurentia, broadly concurrent with the main Scandian collision between the two aforementioned continents. This crustal scale fault structure enabled the juxtaposition of numerous crustal blocks of different Precambrian ancestry that can be found in various regions of the current High Arctic, including Svalbard, Greenland and Ellesmere Island.</p><p>This research was supported by the National Science Centre (Poland) project no. 2015/17B/ST10/03114 and the internal AGH-UST funding to J. Majka, the internal grant of the Polish Geological Institute - NRI no. 62.9012.2014.00.0 to J. Bazarnik and the National Science Foundation (USA) grant EAR1650022 to J. Gilotti and W. McClelland.</p>

Geochemistry of the Lesser Antilles volcanic island arc

1977 ◽  
Vol 41 (6) ◽  
pp. 785-801 ◽  
Author(s):  
G.M Brown ◽  
J.G Holland ◽  
H Sigurdsson ◽  
J.F Tomblin ◽  
R.J Arculus
Keyword(s):  
Island Arc ◽  
Lesser Antilles ◽  
Volcanic Island

scholarly journals The Ordovician Thores volcanic island arc of the Pearya Terrane from northern Ellesmere Island formed on Precambrian continental crust

Lithos ◽  
2021 ◽  
Vol 386-387 ◽  
pp. 105999
Author(s):  
Jarosław Majka ◽  
Karolina Kośmińska ◽  
Jakub Bazarnik ◽  
William C. McClelland
Keyword(s):  
Continental Crust ◽  
Ellesmere Island ◽  
Island Arc ◽  
Volcanic Island

Episodic Ordovician-Silurian plutonism in the Topsails igneous terrane, western Newfoundland

1987 ◽  
Vol 78 (1) ◽  
pp. 17-28 ◽  
Author(s):  
J. B. Whalen ◽  
K. L. Currie ◽  
O. van Breemen
Keyword(s):  
Island Arc ◽  
Granitic Rocks ◽  
Island Arcs ◽  
Volcanic Island ◽  
Zircon Age ◽  
Peralkaline Granite ◽  
Early Ordovician ◽  
Intrusive Rocks ◽  
Igneous Activity ◽  
Magmatic History

ABSTRACTThe Topsails igneous terrane of western Newfoundland contains several intrusive and volcanic suites underlain and separated by screens of older intrusive rocks. The heterogeneous Hungry Mountain complex yielded U-Pb zircon upper and lower intercept ages of 2090 ± 75 Ma and 467 ± 8 Ma, demonstrating a significant inherited component of Aphebian age, while an adjacent suite of relatively massive granodioritic to granitic rocks yielded a slightly discordant U-Pb zircon age of 460 ± 10 Ma. The 438 ± 8 Ma age of the Rainy Lake complex, a suite of island arc type intrusive rocks, suggests it forms part of a Silurian magmatic episode, which also included Springdale Group bimodal volcanics (429 ± 4 Ma), and peralkaline granite and subvolcanic porphyries which intrude the Springdale Group (429 ± 3 Ma and 427 ±3 Ma, respectively). Most igneous units contain a slight component of inherited zircon, but initial 87Sr/86Sr ratios (average 0·704) are similar to calculated ‘Bulk Earth’ values at this time.Available data suggest that the Topsails terrane formed an oceanic tract with active volcanic island arcs when obduction commenced in early Ordovician time. The subsequent magmatic history, including the major but short-lived early Silurian magmatism, can be directly or indirectly related to obduction processes, including over-riding of the Topsails terrane by ophiolitic allochthons. There is no evidence of any Acadian (Devonian) igneous activity in the Topsails terrane.

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