Mineralogy and composition of Kuroko deposits from northeastern Honshu and their possible modern analogues from the Izu-Ogasawara (Bonin) Arc south of Japan: Implications for mode of formation

Abstract This paper examines the nature and behavior of secondary H(igh) tones in Koshikijima Japanese, a highly endangered dialect spoken on three small, remote islands in the south of Japan. This dialect generally has a mora-counting prosodic system with two distinctive accent types/classes (Type A and Type B), and displays two H tones, primary and secondary, in words of three or more moras: The primary H tone appears on the penultimate and final moras in Type A and Type B, respectively, whereas the secondary H tone occurs at the beginning of the word redundantly. Koshikijima Japanese displays regional variations with respect to the secondary H tone, particularly regarding its domain/position, its (in)dependence on the primary H tone, its interaction with the syllable, and its behavior in postlexical phonology. This paper examines how the secondary H tone behaves differently in three distinct accent systems of the dialect: (i) the system described by Takaji Kamimura eighty years ago, (ii) the one that is found quite extensively on the islands today, including Kamimura’s native village (Nakakoshiki) and Teuchi Village, and (iii) the system observed in Kuwanoura Village today. Comparing the three accent systems, this paper also proposes historical scenarios to account for the different behaviors of the secondary H tone across time and space.

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Mineralogy and geochemistry of an Archean tuffaceous exhalite: the Main Contact Tuff, Millenbach mine area, Noranda, Quebec

Canadian Journal of Earth Sciences ◽

10.1139/e89-008 ◽

1989 ◽

Vol 26 (1) ◽

pp. 88-105 ◽

Cited By ~ 14

Author(s):

Stavros I. Kalogeropoulos ◽

Steven D. Scott

Keyword(s):

Trace Elements ◽

Hydrothermal System ◽

The Other ◽

Mine Area ◽

The North ◽

Metalliferous Sediment ◽

Multiple Input ◽

Variable Contribution ◽

Rock Specimens ◽

Kuroko Deposits

The Main Contact Tuff, in the vicinity of Millenbach mine, Noranda, Quebec, is an extensive, although discontinuous, ore-related volcanic exhalative metalliferous sediment, or "tuffaceous exhalite," of Archean age. It was formed by the variable contribution of two constituents: (1) exhalite (chemical) composed mainly of pyrite, quartz, sphalerite, pyrrhotite, and chalcopyrite and (2) tuff (clastic) composed of quartz, chlorite, and sericite.Tuffaceous exhalites such as the Main Contact Tuff and the similar tetsusekiei of the Japanese Kuroko deposits (Miocene age) indicate a fossil hydrothermal system that may or may not have produced economic concentrations of metallic sulfides. The Main Contact Tuff displays cryptic variations, which provide exploration guides at different scales: (1) the Fe/[Fe + Mg] ratios of chlorite decrease from 0.63 to 0.32 over a distance of 0.3 km approaching ore from the north, and from 0.72 to 0.32 over 1.5 km from the south; (2) the FeO/[FeO + MgO] (sulfide-free) ratios of whole-rock specimens decrease from about 0.8 to 0.3 approaching the ore; (3) ilmenite is replaced in the ore zone by rutile and (or) sphene; and (4) the most manganiferous ilmenite is found close to ore. On the other hand, trace elements of exhalative origin (e.g., Ag, Co) in the Main Contact Tuff appear not to provide useful vectors towards ore. They are concentrated relative to normal pelagic rocks, but their distributions with respect to ore are complicated by multiple input sources and postexhalative redistributions of elements.

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