Archean to Paleoproterozoic continental crust growth in the Western Block of North China: Constraints from zircon Hf isotopic and whole-rock Nd isotopic data
Archean to Paleoproterozoic continental crust growth in the Western Block of North China: Constraints from zircon Hf isotopic and whole-rock Nd isotopic data
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华北西地块太古宙至古元古代陆壳生长：来自锆石Hf同位素和全岩Nd同位素数据的制约
DOI：
10.1016/j.precamres.2017.02.018
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发表时间：
2017-12
影响因子：
3.8
通讯作者：
Qiao Hengzhong
中科院分区：
文献类型：
--
作者：
He Xiaolan;Yin Changqing;Long Xiaoping;Qian Jiahui;Wang Luojuan;Qiao Hengzhong
这项研究提出了新的锆石Hf同位素数据，结合之前华北克拉通西地块的锆石U-Pb年代学、原位Hf和全岩Nd同位素数据，为全球范围内的大陆地壳生长和早期地球演化提供了新的见解。特别是阴山地块的火成锆石和碎屑锆石的207Pb/206Pb年龄为2446-2733 Ma，年龄峰值为2524 Ma。其中，86% 的 εHf(t) 值为正，太古宙 Hf 模型年龄 (TDMC) (2.6–2.9 Ga) 峰值为 2840 Ma。这表明西地块的基岩很可能源自于贫化的地幔源区，这意味着在 2.8–2.7 Ga 发生了壳幔分异事件，随后在 ∼2.5 Ga 发生了广泛的再加工。来自孔兹岩带的碎屑锆石超过 95% 的年龄集中在 2.2–2.0 Ga，其 εHf(t) 值在 -5.43 到 +9.54 之间变化，其中 80% 为阳性，且产量 Hf 模型年龄 (TDMC) 在 2250 Ma 处达到峰值。孔兹岩带中εHf(t)值的这些特征也记录在鄂尔多斯地块的基岩中，其年龄框架为2.2–2.0 Ga。这表明鄂尔多斯地块可能是一个年轻的地壳，其中添加了较古老的物质。鄂尔多斯地块南缘下俯冲的开始导致了2.2-2.0Ga岩浆弧的形成，这可能与哥伦比亚超大陆的组装有关。
This study presents new zircon Hf isotopic data, which, combined with previous zircon U-Pb geochronological, in-situ Hf and whole-rock Nd isotopic data from the Western Block of the North China Craton (NCC), provide a new insight into global-scale continental crustal growth and evolution of early Earth. In particular, igneous zircons and detrital zircons from the Yinshan Block yield207Pb/206Pb ages of 2446–2733 Ma, with an age peak at 2524 Ma. Of those, 86% have positiveεHf(t)values and Archean Hf model ages (TDMC) (2.6–2.9 Ga) peaking at 2840 Ma. This indicates that those basement rocks of the Western Block are most likely derived from a depleted mantle source, implying a crust-mantle differentiation event at 2.8–2.7 Ga followed by extensive reworking at ∼2.5 Ga. More than 95% detrital zircons from the Khondalite Belt have ages converging on 2.2–2.0 Ga and theirεHf(t)values vary from −5.43 to +9.54, of which 80% are positive and yield Hf model ages (TDMC) peaking at 2250 Ma. These characteristics ofεHf(t)values in the Khondalite Belt are also documented in the basement rocks of the Ordos Block under same age frame of 2.2–2.0 Ga. This suggests that the Ordos Block may be a juvenile crust with addition of older materials. The initiation of subduction under the southern margin of the Ordos Block leads to the formation of a 2.2–2.0 Ga magmatic arc, which is likely related to the assembly of the supercontinent Columbia.
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影响因子：
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