Geologic position, age, and petrogenesis of plagiogranites in northern Rudny Altai

Kuibida, M. L.; Крук, Н. Н.; Murzin, O. V.; Шокальский, С. П.; Гусев, Н. И.; Kirnozova, T. I.; Травин, А. В.

doi:10.1016/j.rgg.2013.09.012

Cited by 13 publications

(2 citation statements)

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“…The Char ophiolitic mélange in the Irtysh–Zaysan suture zone was locally unconformably overlain by the Serpukhovian conglomerate (Kuibida et al, and references therein), which indicates the onset of a post‐collisional setting. The ~323–322 Ma high‐Al tonalite and plagiogranite from the Irtysh–Zaysan suture zone and Altai arc were explained as the collision‐related granitoids (Kuibida et al, , ), which are slightly older than ~319 Ma Keluke K‐feldspar granite. Importantly, the studied K‐feldspar granite from the Zharma–Saur arc is nearly coeval with the plutons crosscutting the Irtysh–Zaysan suture zone (Figure , ~320 Ma, Glorie et al, ) and Altai arc (Figure , ~318 Ma, Yuan et al, ), and together they represent the oldest stitching plutons invaded rocks of above terrane units.…”

Section: Discussionmentioning

confidence: 99%

Timing of the final closure of the Irtysh–Zaysan Ocean: New insights from the earliest stitching pluton in the northern West Junggar, NW China

Liu

Chen

et al. 2017

Geological Journal

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A tight constraint on the closure time of the Irtysh–Zaysan Ocean, a major southwestern branch of the Paleo‐Asian Ocean, is crucial for understanding the final amalgamation of the Central Asian Orogenic Belt; however, no agreement has been reached. This study presents new zircon U–Pb ages and whole‐rock geochemical data for the Keluke composite pluton in the Zharma–Saur arc of the northern West Junggar (NW China). The Keluke composite pluton mainly includes the hornblende gabbro, gabbroic diorite, and K‐feldspar granite. The laser ablation inductively coupled plasma mass spectrometry zircon U–Pb dating indicates that the hornblende gabbro and K‐feldspar granite formed at 334 ± 1 Ma and 319 ± 4 Ma, respectively. The gabbroic and dioritic rocks are calc‐alkaline and arc‐related plutonism characterized by strong depletions in Nb–Ta–Ti, thus being the product of the subduction of the Irtysh–Zaysan Ocean. By contrast, the K‐feldspar granite is geochemically similar to the post‐collisional highly fractionated I‐type granite. In particular, when compared with regional magmatic events, the Keluke K‐feldspar granite represents the first stitching plutonism in response to the termination of the Irtysh–Zaisan Ocean, which strongly indicates that the Irtysh–Zaisan Ocean was closed prior to the earliest late Carboniferous.

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Section: Discussionmentioning

confidence: 99%

Timing of the final closure of the Irtysh–Zaysan Ocean: New insights from the earliest stitching pluton in the northern West Junggar, NW China

Liu

Chen

et al. 2017

Geological Journal

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“…Those observations allowed them to assume the presence of pre-Late Devonian plagiogranites in Rudny Altai, rocks of which have been ascribed to the Early Devonian Aley sky complex of uncertain volume [2,11]. The first attempts at isotopic dating of those "ancient" granites [14].…”

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Subduction plagiogranites of Rudny Altai: Age and composition characteristics

et al. 2015

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The spatial-temporal relationships and the pecu liarities of petrogenesis of extrusive and intrusive rocks that make up large igneous belts, as well as their con nections to the concentration of ores, are areas of inquiry that perennially attract the attention of researchers. This interest continues because answers to these questions, on the one hand, may provide a fuller understanding of the nature of magmatic pro cesses and, on the other hand, may favor development of new criteria for prospecting ore deposits. The most acute questions are in the areas of diachronous volca nism and intrusive magmatism.One of prominent examples of geological struc tures of the type mentioned is the Hercynian system of Rudny Altai which was formed during the DevonianEarly Carboniferous evolution of the active margin of the Siberian Craton [1-6] (Fig. 1A). There, as a result of two pulses of the Devonian volcanism, thick vol cano-sedimentary members were formed: they are hosts to numerous deposits and ore nodes of sulfidebase metal formation. During the first pulse (EmsianEarly Fransian), the Melnichno Sosnovsky rhyolite (D 1-2 ) and the Davydov-Kamenevsky basalt-dac ite-rhyolite (D 2-3 ) complexes have been formed: those build up large central-type volcanoes and hypabyssal intrusives [4]. The majority of sulfide-base metal deposits were formed during this pulse [7]. In the second pulse (Late Fransian-Famennian) of vol canism in Rudny Altai, some subaerial extrusive, pyroclastic, and subvolcanic rocks of the Pikhtovsky basalt-dacite-rhyolite (D 3 ) complex were formed: they constitute a chain of volcano-tectonic structures along the western edge of the Rudny Altai block.Furthermore, the Rudny Altai area is permeated with intrusive igneous rocks, the major proportion of which is represented by gabbros, plagiogranite, and granite of the Zmeinogorsky complex (D 3 ) (378 ± 6 and 371 ± 2 Ma, SHRIMP II zircon U-Pb age) [8]. Those plutons have been intruded in the tectonic set ting of the transform margin [9] practically simulta neously with the Pikhtovsky volcanic complex (D 3 ).The most important for the question of the igneous geology of Rudny Altai is the presence or absence of granites older than the Late Devonian, synchronous to suprasubduction volcanism per se and syngenetic with subvolcanic porphyry, which are accompanied by sul fide-base metal mineralization. This question has been debated for many years. In the second half of the twentieth century, V.S. Kuzebny [10] compiled systematic observations of the relation between granites and fossiliferous volcano sedimen tary rocks: he concluded there was an absence of such rocks in the northern part of Rudny Altai. However subsequent researchers noted the presence of plagiog ranite pebbles in basal conglomerates of stratified members (beginning from the Emsian) along with the occurrence of leucocratic plagiogranite xenoliths in the Late Devonian granites. Those observations allowed them to assume the presence of pre-Late Devonian plagiogranites in Rudny Altai, rocks of which have been...

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Tectonic Implications and Petrogenesis of the Various Types of Magmatic Rocks from the Zedang Area in Southern Tibet

Xiong

Yang

et al. 2019

J. Earth Sci.

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Geologic position, age, and petrogenesis of plagiogranites in northern Rudny Altai

Cited by 13 publications

References 18 publications

Timing of the final closure of the Irtysh–Zaysan Ocean: New insights from the earliest stitching pluton in the northern West Junggar, NW China

Timing of the final closure of the Irtysh–Zaysan Ocean: New insights from the earliest stitching pluton in the northern West Junggar, NW China

Subduction plagiogranites of Rudny Altai: Age and composition characteristics

Tectonic Implications and Petrogenesis of the Various Types of Magmatic Rocks from the Zedang Area in Southern Tibet

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