On the development of the calc-alkaline and tholeiitic magma series: A deep crustal cumulate perspective

Chin, Emily; Shimizu, K.; Bybee, G. M.; Erdman, Monica E.

doi:10.1016/j.epsl.2017.11.016

Cited by 89 publications

(53 citation statements)

References 104 publications

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“…Intraoceanic or rare continental arcs, like those of the Western Pacific, may record flux melting; mantle peridotites with elevated fO 2 values in these settings have been thought to be influenced by slab-derived oxidizing agents 59,60 . In contrast, continental arcs, like those of the Eastern Pacific arcs where crust thickness may modulate the melting degree 61 , may represent a complicated melting mode involving decompression and mantle peridotite that is not necessarily oxidized 59,62 . Direct comparisons of Western and Eastern Pacific arcs may be challenging due to their different melting modes and arc maturity 59,60 .…”

Section: Discussionmentioning

confidence: 99%

Uncovering and quantifying the subduction zone sulfur cycle from the slab perspective

Schwarzenbach

John

et al. 2020

Nat Commun

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Sulfur belongs among H 2 O, CO 2 , and Cl as one of the key volatiles in Earth's chemical cycles. High oxygen fugacity, sulfur concentration, and δ 34 S values in volcanic arc rocks have been attributed to significant sulfate addition by slab fluids. However, sulfur speciation, flux, and isotope composition in slab-dehydrated fluids remain unclear. Here, we use high-pressure rocks and enclosed veins to provide direct constraints on subduction zone sulfur recycling for a typical oceanic lithosphere. Textural and thermodynamic evidence indicates the predominance of reduced sulfur species in slab fluids; those derived from metasediments, altered oceanic crust, and serpentinite have δ 34 S values of approximately −8‰, −1‰, and +8‰, respectively. Mass-balance calculations demonstrate that 6.4% (up to 20% maximum) of total subducted sulfur is released between 30-230 km depth, and the predominant sulfur loss takes place at 70-100 km with a net δ 34 S composition of −2.5 ± 3‰. We conclude that modest slab-to-wedge sulfur transport occurs, but that slab-derived fluids provide negligible sulfate to oxidize the sub-arc mantle and cannot deliver 34 S-enriched sulfur to produce the positive δ 34 S signature in arc settings. Most sulfur has negative δ 34 S and is subducted into the deep mantle, which could cause a long-term increase in the δ 34 S of Earth surface reservoirs.

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Section: Discussionmentioning

confidence: 99%

Uncovering and quantifying the subduction zone sulfur cycle from the slab perspective

Schwarzenbach

John

et al. 2020

Nat Commun

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“…С известково-щелочным трендом базальтов развиваются значительные скопления гематитовых руд с медью и золотом, которые относятся к Fe-оксидному-Cu-Au типу. Пространственная ассоциация толеитовых и известково-щелочных базальтов на проявлениях Росомаха и Джалкан может свидетельствовать о наличии необнаруженных «недостающих» богатых Fe резервуаров, [8,9] с Fe-оксидными-Cu-Au рудами [10].…”

Section: заключениеunclassified

The Manifestation Rosomakha – High-Productive Type of Fe-Oxide-Cu-Au Mineralization in Basalts of the Ridge Sette-Daban

Kostin¹

2018

УСЕ (ACNR)

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Обобщение данных о выявленных минеральных типах руд, связанных с девонскими базальтами хребта Сетте-Дабан (Восточная Якутия), позволило установить новый для Северо-Востока России генетический тип Fe-оксидных-Cu-Au (iOCG) руд. Его главными особенностями являются высокие содержания железа и меди. Золото всегда присутствует в минеральной форме и может образовывать промышленно значимые концентрации. Поисковыми признаками Fe-оксидных-Cu-Au (iOCG) руд в базальтовых покровах являются разнообразные по морфологии скопления гематита и ассоциирующих минералов меди, а на поверхности коренных обнажений часто присутствует малахит. Содержание меди в базальтах варьирует от 0,37-18,24 %. Медь в самородной форме присутствует уже на стадии застывания базальтовой лавы-обычно это тонкие пленки по границам кристаллов авгита. Позднее брекчирование базальтовых потоков, и цементация гематит-кальцит-борнитовыми рудами приводит к образованию ультрабогатых Fe-Cu руд. Высокая продуктивность базальтов на медь определяется принадлежностью к толеитовой серии. Содержание меди в известково-щелочных разновидностях пород меньше, но с ними большее развитие получили оксиды железа (проявление Хурат и частично Джалкан). Сочетание в пределах одного рудопроявления пород толеитовой и известково-щелочной серий (проявление Росомаха и частично Джалкан), относимых по степени эволюции к ферро-базальтам, является наиболее продуктивным для формирования богатых Fe-оксидных-Cu-Au руд. Fe-оксидных-Cu-Au (iOCG) проявления Джалкан, Росомаха и Хурат располагается в зоне влияния федеральной автодороги «Колыма» (10, 5 и 1 км от автодороги соответственно), что делает экономически целесообразным вовлечение его в геологоразведку.

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“…Earlier we were able to confirm this pattern by the example of IOCG manifestations in the basalts of the Sette-Daban ridge (Yakutia, Russia), where significant accumulations of hematite ores with copper and gold were produced within the calc-alkaline trend of basalts (Kostin, 2018). Similarly, the calc-alkaline trend in the evolution of rocks in conjunction with the identified linear ore zones of the IOCG type may indicate the presence in the deep horizons of undetected iron-rich reservoirs (El-Desoky et al, 2015;Chin et al, 2018) with Fe-oxide-Cu-Au ores. (Irvine and Baragar, 1971) for the Kis-Kuel intrusive rocks (1 -diorite, 2 -granodiorite), showing the relative proportions of the oxides Na 2 O+K 2 O (Alk), FeO+Fe 2 O 3 (FeO*) and MgO.…”

Section: Discussionmentioning

confidence: 99%

The Kis-Kuel Fe-Cu-Au±(Ag, Mo, Bi) deposit, Eastern Yakutia (Russia) – a link between Iron Oxide Copper-Gold and Intrusion Related Gold systems

Костин

2019

Vestnik SPbSU. Earth Sciences

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The iron oxide copper-gold (IOCG) deposit class includes a number of loosely related deposits with a pool of common characteristics. The Kis-Kuel intrusion-related IOCG deposit in Eastern Yakutia (Russia) with a wide range of mineral styles has a direct genetic link with a cooling intrusion during its formation. The IOCG and the Kis-Kuel have common features for this style-an abundance of iron oxides and a low presence of sulfides. Magmatic contribution to the Kis-Kuel deposit is significant. Intrusive rocks range from diorite to granodiorite in composition. The rare-earth geochemical system of igneous rocks of the Kis-Kuel intrusion is characterized by behavior close to the CHArge-and-RAdius-Controlled CHARAC-system (26 < Zr/Hf < 46 and 24 < Y/Ho < 34) in which the Н/Ho-Zr/Hf ratios of the pair show a distribution close to chondrite (Zr/Hf-36.6 and Y/Ho-27.7). Minor deviations of the Kis-Kuel rocks from CHARAC intervals indicate an unevolved magmatic system. Mineralization was discovered at the top of the small Kis-Kuel pluton and includes several types of ore. Iron oxide copper-gold and Cu-Auporphyry ore are present as breccia in hornfels aureole of intrusive rocks with FeOX-13.58-63.24 %; Cu-0-3.57 %; Au-12.93-64.48 g/t; Ag-2.7-830 g/t. Associated with IOCG, quartzhematite-galena veins contain: Ag-22.4-3680 g/t; Cu-0.014-0.534 %; Pb-0.1-81.63 %. Arrays of sheeted auriferous quartz veins with arsenopyrite, native gold and bismuth and Ag-Bi sulphosalts contain: Au-0.15-4.6 g/t; Ag-20.6-196 g/t; Cu-0.048-0.24 %; Pb-0.3-3.73 %. This paper is devoted to a Kis-Kuel diorite-granodiorite-related deposit in Eastern Yakutia (Russia). It is regarded as an intrusion-related gold deposit (IRGD) with a main IOCG and minor Cu-Au-porphyry component of mineralization.

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On the development of the calc-alkaline and tholeiitic magma series: A deep crustal cumulate perspective

Cited by 89 publications

References 104 publications

Uncovering and quantifying the subduction zone sulfur cycle from the slab perspective

Uncovering and quantifying the subduction zone sulfur cycle from the slab perspective

The Manifestation Rosomakha – High-Productive Type of Fe-Oxide-Cu-Au Mineralization in Basalts of the Ridge Sette-Daban

The Kis-Kuel Fe-Cu-Au±(Ag, Mo, Bi) deposit, Eastern Yakutia (Russia) – a link between Iron Oxide Copper-Gold and Intrusion Related Gold systems

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