Submarine calderas: A key to the formation of volcanogenic massive sulfide deposits?
スポンサーリンク
概要
- 論文の詳細を見る
A currently popular model for the formation of volcanogenic massive sulfide deposits, based largely on isotopic studies and substantiated by water-rock experiments, implies that the ores were formed near the seafloor from hydrothermal solutions of seawater origin. Some of the major questions unanswered from this model have been: (1) the reason for the development of large scale seawater circulation systems through volcanic rocks in particular areas and during specific stages of submarine volcanism (e.g., ore formation after the eruptions of large volumes of volcanic materials), (2) the reason for the association with rapid-subsidence structures, (3) the mechanism for high temperature mineralization on or near the seafloor, and (4) the reason for metal and mineral zonings. Such questions can, however, be answered satisfactorily by a hypothesis that the hydrothermal processes which produced volcanogenic massive sulfide deposits occurred as a result of the creation of submarine calderas.<BR>Geologic and petrochemical data are presented to suggest that the middle Miocene "Hokuroku Basin" in northern Japan, in which the largest concentration of the Kuroko ores occur, was a submarine resurgent caldera, and that the initiation and the termination of the mineralization were controlled, by the subsidence, and then by the resurgency of the caldera. Submarine calderas also appear to have played a major role in the formation of massive sulfide deposits in the other areas, such as the Bathurst district in Canada, the Rosebery-Mt. Lyell district in Tasmania, and in Cyprus.
- 資源地質学会の論文
資源地質学会 | 論文
- 資源情報 2008年度秋季講習会 西南北海道の中新世熱水活動と金属鉱化作用
- 飛騨帯の石灰岩類 -地質特性・構成鉱物・岩石組織とドロマイトの産状-
- 飛騨帯神岡鉱床周辺の変閃緑岩・変斑れい岩類
- 神岡鉱床周辺のいわゆる伊西ミグマタイトとスカルン鉱(杢地鉱)中の単斜輝石の組成変化
- 北部北上山地南東部, 大谷山鉱山北方地域に分布する層状マンガン鉱床の層位学的研究