Detrital zircon evidence for the antiquity of Taiwan
Detrital zircon evidence for the antiquity of Taiwan
复制标题
DOI：
10.1007/s12303-009-0023-3
复制
发表时间：
2009-11
影响因子：
1.2
通讯作者：
C. Lan;T. Usuki;Kuo‐Lung Wang;T. Yui;K. Okamoto;Yuan-Hsi Lee;T. Hirata;Yoshitaka Kon;Y. Orihashi;J. Liou;Chun-Sun Lee
中科院分区：
文献类型：
--
作者：
C. Lan;T. Usuki;Kuo‐Lung Wang;T. Yui;K. Okamoto;Yuan-Hsi Lee;T. Hirata;Yoshitaka Kon;Y. Orihashi;J. Liou;Chun-Sun Lee
对台湾中央山脉前第三纪基底杂岩和始新世岩石中的锆石进行原位 U-Pb 年代学和 Hf 同位素研究，以阐明年龄超过 2.3 Ga 的碎屑锆石的历史。东部骨干山脉和东部中央山脉的锆石年龄为古元古代至新太古代晚期（2.3−≥2.5 Ga），而来自台湾中部山脉的锆石年龄为古元古代至新太古代晚期（2.3−≥2.5 Ga）。 雪山山脉给出了新太古代到中太古代的年龄（2.6-3.2Ga）。古元古代到新太古代晚期锆石的ɛHf(T)变化范围为-7.4到+5.1，这意味着新生地壳的生长和旧地壳的改造。根据 Hf 同位素模型年龄，这种双重起源可以追溯到中太古代 - 古太古代（3.0-3.4 Ga）。与华夏相比，台湾锆石的 ɛHf(T) 值和 Hf 地壳模型年龄一致但更窄，这表明这些锆石可能具有共同起源，尽管台湾的地壳演化历史总体上比中国东南部更年轻。
In-situ U-Pb geochronology and Hf isotopic studies of zircons from the Pre-Tertiary basement complex and Eocene rocks of the Central Range of Taiwan were carried out to elucidate the history of detrital zircons older than 2.3 Ga. Zircons from the eastern Backbone Range and Eastern Central Range show Paleoproterozoic to late Neoarchean ages (2.3−≥2.5 Ga), whereas those from the Hsuehshan Range yield Neoarchean to Mesoarchean ages (2.6–3.2Ga). The ɛHf(T) for the Paleoproterozoic to late Neoarchean zircons varies from −7.4 to +5.1, implying both juvenile crustal growth and reworking of old crusts. This dual origin could extend back to Mesoarchean-Paleoarchean (3.0–3.4 Ga) based on Hf isotopic model ages. Consistent but narrower ɛHf(T) values and Hf crustal model ages for zircons from Taiwan compared to Cathaysia suggest a possible common origin for these zircons, although Taiwan has a generally younger crustal evolution history than SE China.