Volcanic Rocks in the Udyl’ Segment of the Kiselevka–Manoma Accretionary Terrane (Sikhote-Alin): Petrogeochemistry, Formation Conditions, and Tectonic Setting

2020 ◽  
Vol 14 (5) ◽  
pp. 399-414
Author(s):  
I. P. Voinova ◽  
A. N. Didenko ◽  
A. V. Kudymov ◽  
A. Yu. Peskov ◽  
M. V. Arkhipov
Keyword(s):  
Tectonic Setting ◽  
Volcanic Rocks ◽  
Sikhote Alin ◽  
Formation Conditions

scholarly journals TAEZHNY EPITHERMAL DEPOSIT OF SILVER ORE (SIKHOTE-ALIN): REGIONAL POSITION, FORMATION CONDITIONS, GEOCHEMISTRY AND MINERAL COMPOSITION

2021 ◽  
pp. 21-38
Author(s):  
V.V. Ratkin ◽  
◽  
L.F. Simanenko ◽  
V.A. Pakhomova ◽  
O.A. Eliseeva ◽  
...  
Keyword(s):  
Volcanic Rocks ◽  
Sikhote Alin ◽  
Vein Deposit ◽  
Geochemical Zoning ◽  
Sodium Chloride Solutions ◽  
Ore Bodies ◽  
The Pacific ◽  
Formation Conditions ◽  
Regional Position ◽  
Rock Complex

The Taezhny is a silver with gold (Au:Ag = 1:100) vein deposit with a pronounced mineralogical and geochemical selenium specializationof ores. The deposit is located in the eastern part of the Sikhote-Alin orogenic belt, 700 km north of Vladivostok. The regional position of the describable ore-bearing area, similar to the Mexican deposits of the Guanajuato area typical of the Pacific region, is determined by its relationto the Early Cretaceous island-arc terrane with a distinct geochemical enrichment in silver of its folded rock complex. Quartz vein bodies are located in submeridional fracturesfeathering NE-trending sinistral strike slip faults.The near-ore alteration is dominated bysericitization and silicification of host sandstones. The main silver minerals are freibergite, acanthite, and Se-containing pyrargyrite, polybasite, stephanite. Kustelite, electrum, aguilarite, allargentum, and discrasite are much less abundant. The mineralogical and geochemical zoning of ore bodies emphasized by a highly productive Ag-sulfosalt assemblage enriched in Sein the upper part of veins and the poor ores with predominant acanthite at depth is revealed.The veins were formed with the participation of sodium chloride solutions saturated with CO2 and CH4, at the temperature range from 400 to 150° C. The deposition of productive sulfosalt-bearingassemblages occurred with a suddendecrease in pressure under conditions of discharge of magmatic-meteoric fluids in circulation zones in the sandstones under the screen of volcanic rocks overlying the Kema terrane.

Age, petrogenesis and tectonic setting of the Thessalon volcanic rocks, Huronian Supergroup, Canada

2013 ◽  
Vol 233 ◽  
pp. 144-172 ◽  
Author(s):  
Kirsty Y. Ketchum ◽  
Larry M. Heaman ◽  
Gerry Bennett ◽  
David J. Hughes
Keyword(s):  
Tectonic Setting ◽  
Volcanic Rocks

Age, chemistry, and tectonic setting of Miramichi terrane (Early Paleozoic) volcanic rocks, eastern and east-central Maine, USA

2021 ◽  
Vol 57 ◽  
pp. 239-273
Author(s):  
Allan Ludman ◽  
Christopher McFarlane ◽  
Amber T.H. Whittaker
Keyword(s):  
New Brunswick ◽  
Subduction Zone ◽  
Tectonic Setting ◽  
Volcanic Rocks ◽  
Calc Alkaline ◽  
East Central ◽  
Arc Volcanism ◽  
Middle Ordovician ◽  
Volcanic Suite ◽  
Back Arc

Volcanic rocks in the Miramichi inlier in Maine occur in two areas separated by the Bottle Lake plutonic complex: the Danforth segment (Stetson Mountain Formation) north of the complex and Greenfield segment to the south (Olamon Stream Formation). Both suites are dominantly pyroclastic, with abundant andesite, dacite, and rhyolite tuffs and subordinate lavas, breccias, and agglomerates. Rare basaltic tuffs and a small area of basaltic tuffs, agglomerates, and lavas are restricted to the Greenfield segment. U–Pb zircon geochronology dates Greenfield segment volcanism at ca. 469 Ma, the Floian–Dapingian boundary between the Lower and Middle Ordovician. Chemical analyses reveal a calc-alkaline suite erupted in a continental volcanic arc, either the Meductic or earliest Balmoral phase of Popelogan arc activity. The Maine Miramichi volcanic rocks are most likely correlative with the Meductic Group volcanic suite in west-central New Brunswick. Orogen-parallel lithologic and chemical variations from New Brunswick to east-central Maine may result from eruptions at different volcanic centers. The bimodal Poplar Mountain volcanic suite at the Maine–New Brunswick border is 10–20 myr younger than the Miramichi volcanic rocks and more likely an early phase of back-arc basin rifting than a late-stage Meductic phase event. Coeval calc-alkaline arc volcanism in the Miramichi, Weeksboro–Lunksoos Lake, and Munsungun Cambrian–Ordovician inliers in Maine is not consistent with tectonic models involving northwestward migration of arc volcanism. This >150 km span cannot be explained by a single east-facing subduction zone, suggesting more than one subduction zone/arc complex in the region.

Age, petrogenesis, and tectonic setting of the Permian bimodal volcanic rocks in the eastern Jiamusi Massif, NE China

2017 ◽  
Vol 134 ◽  
pp. 160-175 ◽  
Author(s):  
Jun-Hui Bi ◽  
Wen-Chun Ge ◽  
Hao Yang ◽  
Zhi-Hui Wang ◽  
Yu Dong ◽  
...  
Keyword(s):  
Tectonic Setting ◽  
Volcanic Rocks ◽  
Ne China

Chapter 4.1b Antarctic Peninsula: petrology

2021 ◽  
pp. M55-2018-40
Author(s):  
Malcolm J. Hole
Keyword(s):  
Antarctic Peninsula ◽  
Tectonic Setting ◽  
Volcanic Rocks ◽  
Passive Margin ◽  
Ridge Crest ◽  
Ridge Subduction ◽  
Simple Geometry ◽  
Key Issues ◽  
The Antarctic ◽  
Slab Window

AbstractScattered occurrences of Miocene–Recent volcanic rocks of the alkaline intraplate association represent one of the last expressions of magmatism along the Antarctic Peninsula. The volcanic rocks were erupted after the cessation of subduction which stopped following a series of northward-younging ridge crest–trench collisions. Volcanism has been linked to the development of a growing slab window beneath the extinct convergent margin. Geochemically, lavas range from olivine tholeiite through to basanite and tephrite. Previous studies have emphasized the slab-window tectonic setting as key to allowing melting of peridotite in the asthenospheric void caused by the passage of the slab beneath the locus of volcanism. This hypothesis is revisited in the light of more recent petrological research, and an origin from melting of subducted slab-hosted pyroxenite is considered here to be a more viable alternative for their petrogenesis. Because of the simple geometry of ridge subduction, and the well-established chronology of ridge crest–trench collisions, the Antarctic Peninsula remains a key region for understanding the transition from active to passive margin resulting from cessation of subduction. However, there are still some key issues relating to their tectonomagmatic association, and, principally, the poor geochronological control on the volcanic rocks requires urgent attention.

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