古亚洲构造域侵入岩时—空演化框架
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本文为国家自然科学基金委员会和中国科学院“板块构造与大陆动力学”学科发展战略项目、“侵入岩大地构造重大关键地质问题研究”(编号: 中地调研合同\[2014\]第169号)、“全国侵入岩成矿地质背景研究” (编号: 中地调研合同\[2012\]第107号)、中国地质调查局项目“内蒙古东部—黑龙江西部燕山期火成岩特征及其成矿意义”(编号: 12120114020901)、“内蒙古中东部—黑龙江中生代岩浆作用与金(银)铜(钼)矿成矿作用研究” (编号: 1212011121075)的成果。


The Intrusive Spatial—Temporal Evolutional Framework in the Paleo Asian Tectonic Domain
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    摘要:

    长期以来,许多著名学者提出众多模型,讨论古亚洲构造域的构造演化和造山(带)结构样式。但是,认识上的分歧很大,特别是关于主洋盆的空间位置和闭合时间。本文主要基于中国侵入岩大地构造编图(1∶250万)和研究这个侧面,参与讨论。① 侵入(岩)弧,碰撞和后造山岩石组合,随时间由西向东变新,同时,主构造带走向从近东西向转为近南北向,暗示古亚洲洋的闭合最终转化为太平洋构造域。② 位于主洋盆北侧的是宽阔的西伯利亚克拉通南缘的沟—弧—盆系统;位于南侧的西面为南天山被动陆缘,中部为塔里木克拉通北缘的窄的沟—弧—盆系统,东面为华北克拉通北缘的活动陆缘。③ 主体侵入(岩)弧的内部分散地分布着从Pt3开始的残留弧和残留oφ,被看做是主体弧的基底。 ④ 传统上认为的构造相对稳定的“地块”,本文基于它们的侵入(岩)组合归为残留弧,认为不是构造上相对稳定的性质,并未采用“地块”的术语,而把它们看作洋陆转换过程中早期残余岛弧处理。⑤ 提出主洋盆的识别有三个标志,(a) 洋闭合最晚,(b) 或为双向俯冲(当两侧均为活动大陆边缘时),或单向俯冲(当一侧为被动陆缘,另一侧为活动陆缘时),(c) 长寿命的洋以及洋闭合带常常发育地中海式残余洋发育的陆—陆碰撞早阶段。 ⑥ 该构造域主要发育Pt3—T的侵入(岩)弧和oφ,支持Sngor等关于大量新生陆壳的推测,亦与大量花岗岩类为εNd(t)“+”值符合。新生陆壳的形成又暗示,长时间的洋俯冲必导致地幔的冷却,以及大量榴辉岩进入地幔,最终导致高密度的地幔下降流形成,必导致洋的闭合与随后的陆—陆碰撞,形成最初的东亚大陆。

    Abstract:

    For a long time a lot of the models about the tectonic evolution and the orogenic architecture of the Paleo Asian tectonic domain are suggested by many famous geologists. However, there are large divergence of the views, especially about both the space distribution and the closing time of the Paleo Asian Ocean. Based on the intrusive tectonic map of China with the scale of 1:2500, 000, by this paper we would like to join the discussion. (1) The formation of the intrusive arc, and the collisional as well as the postorogenic igneous petrotectonic assemblages is occurred progressively younger from west to east with time, and the trend lines of the main tectonic zones is developed from near east—west in the west to near north—south directions in the east, both of which is suggested the transition of the Paleo Asian Ocean closing to development of the Pacific tectonic domain. (2) The broad trench—arc—basin system developed at the southern margin of the Siberia craton situated in the north of the main oceanic basin; the passive continental margin at the west, and the narrow trench—arc—basin system in the middle, as well as the active continental margin at the east, respectively, developed at the northern margin of the Tarim—North China craton. (3) Both the remnant arc and the oφ since Pt3 is scattered within the main arc, and is regarded as the basement beneath the main arc. (4) The classical “massif” in the orogenic zone is considered to be the remnant arc by this paper, because they are intrusive arc formed in the early stage during the oceanic subduction. (5) The main oceanic basin is recognized from three signs by this paper, (a) The closing of the ocean is latest, (b) The oceanic subduction is bidirectional when the active arc at both the sides, or is developed at one side when one side is active continental margin, and the other side is passive continental margin, (c) The long live and the residue ocean of the Mediterranean sea type are developed as the early stage of the continent—continent collision. (6) A lot of both the intrusive arcs and the oφ during Pt3—T support the formation of the large amount of the juvenile continental crust by Sngor et al., as well as is corresponded to the positive value of the εNd(t) for the granites, which, in turn, is suggested to be formation of the large amount of the oceanic subduction resulted in the cooling of the mantle, and the adding eclogites into the mantle, finally, the high density mantle flow is formed as the dynamic source for the closing of the Paleo Asian Ocean and then the collision between the Siberia and the Tarim—North—China cratons.

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邓晋福,冯艳芳,狄永军,刘翠,肖庆辉,苏尚国,赵国春,孟斐,车如风.2015.古亚洲构造域侵入岩时—空演化框架[J].地质论评,61(6):1211-1224,[DOI].
DENG Jinfu, FENG Yanfang, DI Yongjun, LIU Cui, XIAO Qinghui, SU Shangguo, ZHAO Guochun, MENG Fei, CHE Rufeng.2015. The Intrusive Spatial—Temporal Evolutional Framework in the Paleo Asian Tectonic Domain[J]. Geological Review,61(6):1211-1224.

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  • 收稿日期:2015-05-05
  • 最后修改日期:2015-08-20
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  • 在线发布日期: 2015-11-13
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