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Manganiferous schists and their origin, Hidaka Mountains, Hokkaido, Japan

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Abstract

Manganiferous quartz-mica schists (4 m in stratigraphic thickness) overlie epidote amphibolite in the Chiroro River area, Hidaka Mountains, Hokkaido. The schist layers have a considerable range of A/F ratios and bulk oxidation ratios which vary from 21.5 to 100. Manganese contents are from 4 to 30 times higher than that of the average shale with 0.09% MnO. The schists are essentially quartz-white mica-biotite-Mn garnet-tourmaline-±epidote-magnetite assemblages. A highly oxidized layer (5–8 cm thick) 95 cm above the epidote amphibolite contact is characterized by viridine-piemontite-spessartine-Mn white mica-Mn tourmaline-Ti-Mn haematite indicative of both high initial manganese content and very high f O2 conditions of recrystallization.

Viridine contains up to 17 mol% Mn3+SiO5 and coexists with piemontite with between 13.6 and 15.4 wt% Mn2O3. Mn-poor-Fe-rich (Ps32) epidote occurs in the less oxidized schist enclosing the viridine-piemontite bearing seam. Garnets vary widely in composition with end member variations (mol%) of Spess22.9–80.5; And0.2–11.7; Alm1.1–57.1; Pyr2.0–12.2; Gross7.0–49.0. The more manganiferous garnets occur in rocks with higher oxidation ratios while almandiferous varieties occur in schists with low oxidation ratios. Biotite ranges from green to red-brown varieties (increasing Ti and Fe) with Mg/ (Mg+Fe) ratios varying from 56 to 48. Ten to fifteen percent octahedral R2+ is replaced by Al indicating a trend towards eastonite-siderophyllite. The white micas deviate only slightly from dioctahedral stoichiometry but have up to 25% of octahedral sites occupied by Fe, Mg and to a lesser extent Mn and Ti as R2+ Si4+⇌2Al3+ and in highly oxidized rocks as (Fe,Mn)3+⇌Al3+. The white mica in the highly oxidized viridine-piemontite schist is pale pinkishorange, exhibits reverse pleochroism, and has between 0.30 and 0.43 wt% Mn2O3.

There is a close comparison, both in terms of stratigraphic thickness and Fe-Mn variation, between the Chiroro schist sequence and many oceanic cores so that the bulk chemistry and mineralogy of the pelitic schists is largely an extension of the original Eh-pH conditions of hemipelagic sedimentation and post-depositional adjustments during diagenesis. The thin viridine-piemontite bearing schist is correlated with an oxidized, Fe-Mn rich layer commonly found in present day oceanic cores. The viridine presumably formed by reaction of original ferro-manganese microgranules and clay minerals. Halmrolytic alteration of the underlying metabasalt resulted in leaching of Mn and Fe (in particular) into the overlying sediments and the formation of concentrations of haematite — manganese oxide — Mn garnet along the schist-epidote amphibolite contact.

Estimation of the P-T conditions of metamorphism from the phase relations and compositions in the epidote amphibolite associated with the manganiferous schist gives T °C = 530∼560 and a minimum P fluid > 3 kb which corresponds to the epidote amphibolite facies of Barrovian-type terrains.

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Authors and Affiliations

  1. Department of Joint Mineral Sciences, Victoria, University of Wellington, Wellington, New Zealand

    Rodney H. Grapes

  2. Department of Geology and Mineralogy, Hokkaido University, Sapporo, Japan

    Seiji Hashimoto

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  1. Rodney H. Grapes
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  2. Seiji Hashimoto
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This paper is dedicated to Professor Kenzo Yagi on the occasion of his retirement from the Chair of Mineralogy, Department of Geology and Mineralogy, Hokkaido University, Sapporo, Japan

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Grapes, R.H., Hashimoto, S. Manganiferous schists and their origin, Hidaka Mountains, Hokkaido, Japan. Contr. Mineral. and Petrol. 68, 23–35 (1978). https://doi.org/10.1007/BF00375444

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