Metallogenic epochs in the Inner Zone of southwest Japan
Metallogenic epochs in the Inner Zone of southwest Japan
复制标题
日本西南部内陆带的成矿时代
DOI：
10.1016/s0169-1368(98)00002-x
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发表时间：
1998
影响因子：
3.3
通讯作者：
N. Imoto
中科院分区：
文献类型：
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作者：
M. Watanabe;H. Nishido;K. Hoshino;Y. Hayasaka;N. Imoto
主要根据放射性和微体化石年龄数据，对日本西南部内带的主要成矿时代进行了如下分类：（1）早寒武世：以蛇绿岩杂岩中的豆荚状铬铁矿矿床为特征;这些矿床是日本群岛最早形成的矿床，可能形成于岛弧环境的浅地幔中;（2）石炭纪至二叠纪：其特征是Besshi型贱金属硫化物矿床，主要与玄武岩成分的海底熔岩和凝灰岩（包括其变质等价物）有关，以及与海底酸性凝灰岩有关的层状含铜黄铁矿矿床。这两种类型的矿床都可能形成于弧后盆地环境，地球化学上受岛弧的影响;（3）中三叠世至侏罗纪：以与层状硅质岩有关的层状锰矿（包括其变质的等价物）为特征，这些矿床可能是在具有有限电流循环的洋盆环境中由温泉活动形成的。锰矿床及其容矿岩石是海底加积作用的结果;（4）晚白垩世-早第三纪：以广泛的陆弧岩浆作用（火山岩和深成岩）为特征，形成多种类型的存款，主要与钛铁矿系列（晚白垩世）或磁铁矿系列（早第三纪）花岗质岩石有关。与前者有关的是多金属矽卡岩和含Cu、Sn和W的脉;与这种成矿活动有关的还有与前钛铁矿系列花岗岩类陆上长英质火山碎屑岩有关的高岭土、叶蜡石和绢云母的层控热液粘土矿床。磁铁矿系列矿床以含辉钼矿脉和绢云母型矿床为特征，局部有矽卡岩和脉状产出。与日本西南部发生的钛铁矿系列花岗岩一样，无论矿石类型如何，这些矿床也存在向东年轻的现象;（5）新近纪：以强烈的酸性成分海底火山活动和与之相关的黑子矿床为特征，位于日本新近纪第三纪的主要构造分区和主要成矿省--绿色凝灰岩地区。这些矿床可能与日本海的打开有关。在“非绿色凝灰岩区”，重要的成矿事件以沉积铀矿床和以Au、Sb或Hg矿点为特征的矿脉为代表;（6）上新世-更新世：以浅成热液Au-Ag和Au-Ag-Cu矿脉为特征，与上新世-更新世的陆上安山岩至英安质火山岩有关。（7）第四纪：以火山硫矿床和少量铁砂矿床为特征。
The principal metallogenic epochs in the Inner Zone of southwestern Japan are classified by considering mainly radiometric and microfossil age data, as follows—(1) Early Cambrian Epoch: Characterized by podiform-type chromite deposits hosted in ophiolite complexes; these are the earliest-formed mineral deposits in the Japanese Islands, and probably formed in the shallow mantle of island-arc settings; (2) Carboniferous to Permian Epoch: Characterized by Besshi-type base metal sulfide deposits mainly associated with submarine lavas and tuffs of basaltic composition including their metamorphosed equivalents, and by bedded cupriferous pyrite deposits associated with submarine acidic tuffs. Both types of deposits would have been formed in a back-arc basin environment, geochemically influenced by an island-arc; (3) Middle Triassic to Jurassic Epoch: Characterized by most of the bedded manganese deposits associated with bedded cherts, including their metamorphosed equivalents, which would have formed by hot spring activity in an ocean basin environment with a limited current circulation. The manganese deposits and their host rocks are the result of seafloor accretion; (4) Late Cretaceous to Paleogene Epoch: Characterized by extensive continental-arc magmatism (volcanic and plutonic), resulting in formation of various mineral deposit types, related mainly to ilmenite series (Late Cretaceous) or magnetite series (Paleogene) granitic rocks. Related to the former are polymetallic skarns and veins containing Cu, Sn and W; also related to this metallogenic activity are stratabound hydrothermal clay deposits of kaolin, pyrophyllite, and sericite associated with pre-ilmenite series granitoids subaerial felsic pyroclastic rocks. Molybdenite-bearing veins and replacement-type sericite deposits are characteristics of the magnetite series terranes, with local skarns and vein occurrences. As with ilmenite — series granitoids occurring in southwestern Japan, eastward younging is also recognized in these mineral deposits, regardless of ore type; (5) Neogene Epoch: Characterized by intense submarine volcanism of acidic composition and associated Kuroko deposits in the Green Tuff region, a major tectonic division and a major metallogenic province of the Neogene Tertiary of Japan. These mineral deposits would be related to Japan Sea opening. In the `Non-Green Tuff region,' important mineralization events are represented by sedimentary uranium deposits, and veins characterized by Au, Sb or Hg occurrences; (6) Plio-Pleistocene Epoch: Characterized by epithermal Au–Ag and Au–Ag–Cu veins associated with subaerial andesitic to dacitic volcanic rocks of Plio-Pleistocene age. Volcanism of this and following epochs is characteristic of an island-arc setting; and (7) Quaternary Epoch: Characterized by volcanic sulfur deposits and minor iron sand deposits.
佐藤晃平：《日本成矿学（1）前增生成矿作用》岛弧。
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