The Geodynamic Implications of Passive Margin Subduction in Northwest Turkey
The Geodynamic Implications of Passive Margin Subduction in Northwest Turkey
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土耳其西北部被动边缘俯冲的地球动力学意义
DOI：
10.1029/2022gc010481
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Licht, A.
中科院分区：
文献类型：
--
作者：
Campbell, C. F.;Mueller, M. A.;Taylor, M. H.;Ocakoğlu, F.;Möller, A.;Métais, G.;Coster, P. M. C.;Beard, K. C.;Licht, A.
俯冲带的数量促进了源自冈瓦纳大陆的阿纳托利德-牛里德大陆地体向北平移到土耳其西部经度的欧亚大陆南缘，这一点存在争议。我们假设，如果两个北倾俯冲带促进了土耳其西部的早期碰撞，那么新特提斯洋内和欧亚大陆南缘就会形成晚白垩世弧。为了确定新特提斯大陆内是否形成了岛弧，我们调查了中央萨卡里亚盆地的沉积记录，该盆地于 85 至 4500 万年前沿着欧亚大陆南缘沉积。沉积在萨卡里亚盆地中部（Değirmenözü 地层）较低层的碎屑锆石与从南向北的古电流有关，并表现出源自同位素幼年地幔熔体的单峰白垩纪晚期峰值。 Değirmenözü 地层群的锆石最大沉积年龄在 95 至 90 Ma 之间，比生物地层沉积年龄早 5-10 Myr。在 95 到 80 Ma 之间，上覆耶尼帕扎尔地层中的 εHf 值发生了从地幔到地壳的 12 个单位的转变。我们解释了古生代、欧亚来源的碎屑锆石的缺失、从地幔到地壳衍生的 εHf 值的快速转变，以及孤立的洋内俯冲带内被动边缘俯冲的滞后时间，该俯冲带的岛弧在早期碰撞期间从南向北重新加工到中央萨卡里亚盆地。因此，欧亚大陆内广泛露头的晚白垩世深成岩必定属于附加的汇聚边缘。
The number of subduction zones that facilitated the northward translation of the Anatolide‐Tauride continental terrane derived from Gondwana to the southern margin of Eurasia at the longitude of western Turkey is debated. We hypothesized that if two north dipping subduction zones facilitated incipient collision in western Turkey, a late Cretaceous arc would have formed within the Neotethys and along the southern margin of Eurasia. To determine if an island arc formed within the Neotethys we investigated the sedimentary record of the Central Sakarya basin, which was deposited along the southern margin of Eurasia from 85 to 45 million years ago. Detrital zircon deposited within the lower levels of the Central Sakarya basin (the Değirmenözü Formation) are associated with south to north‐directed paleocurrents and exhibit a unimodal late Cretaceous age peak sourced from isotopically juvenile mantle melts. Zircon maximum depositional ages from the Değirmenözü Formation cluster between 95 and 90 Ma and are 5–10 Myr older than biostratigraphic depositional ages. Between 95 and 80 Ma, a 12‐unit shift from mantle to crustal derived εHf values occurs in the overlying Yenipazar Formation. We explain the absence of Paleozoic, Eurasian‐sourced detrital zircon, the rapid shift from mantle to crustal derived εHf values, and lag time in terms of passive margin subduction within an isolated intra‐oceanic subduction zone, whose island arc was reworked from south to north into the Central Sakarya basin during incipient collision. Thus, widely outcropping late Cretaceous plutonic rocks within Eurasia must have belonged to an additional convergent margin.
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DOI：
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