In the Cleaverville area of Western Australia, the Regal, Dixon Island, and Cleaverville Formations preserve a Mesoarchean lower‐greenschist‐facies volcano‐sedimentary succession in the coastal Pilbara Terrane. These formations are distributed in a rhomboidal‐shaped area and are unconformably overlain by two narrowly distributed shallow‐marine sedimentary sequences: the Sixty‐Six Hill and Forty‐Four Hill Members of the Lizard Hills Formation. The former member is preserved within the core of the Cleaverville Syncline and the latter formed along the northeast‐trending Eighty‐Seven Fault. Based on the metamorphic grade and structures, two deformation events are recognized: D₁ resulted in folding caused by a collisional event, and D₂ resulted in regional sinistral strike‐slip deformation. A previous study reported that the Cleaverville Formation was deposited at 3020 Ma, after the Prinsep Orogeny (3070–3050 Ma). Our SHRIMP U–Pb zircon ages show that: (i) graded volcaniclastic–felsic tuff within the black shale sequence below the banded iron formation in the Cleaverville Formation yields an age of (3 114 ±14) Ma; (ii) the youngest zircons in sandstones of the Sixty‐Six Hill Member, which unconformably overlies pillow basalt of the Regal Formation, yield ages of 3090–3060 Ma; and (iii) zircons in sandstones of the Forty‐Four Hill Member show two age peaks at 3270 Ma and 3020 Ma. In this way, the Cleaverville Formation was deposited at 3114–3060 Ma and was deformed at 3070–3050 Ma (D₁). Depositional age of the Cleaverville Formation is at least 40–90 Myr older than that proposed in previous studies and pre‐dates the Prinsep Orogeny (3070–3050 Ma). After 3020 Ma, D₂ resulted in the formation of a regional strike‐slip pull‐apart basin in the Cleaverville area. The lower‐greenschist‐facies volcano‐sedimentary rocks are distributed only within this basin structure. This strike‐slip deformation was synchronous with crustal‐scale sinistral shear deformation (3000–2930 Ma) in the Pilbara region.

中文翻译：

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西澳大利亚州Pilbara沿海Pilbara Terrane的Cleaverville地区，Cleaverville组沉积的时间和发育以及增生后拉分系统

在西澳大利亚州的Cleaverville地区，富豪，狄克逊岛和Cleaverville地层保留了沿海Pilbara Terrane的Mesoarchean低绿片岩相火山沉积相继。这些地层分布在菱形区域内，并被两个狭窄分布的浅海沉积层序不一致覆盖：蜥蜴山地层的六十六山和四十四山成员。前者保留在Cleaverville Syncline的核心内，后者沿东北趋势的八十七断层形成。根据变形程度和结构，可以识别两个变形事件：D ₁导致碰撞事件导致折叠，D ₂导致区域性左弦走滑变形。先前的研究报告称，在Prinsep造山运动（3070–3050 Ma）之后，Cleaverville组沉积于3020 Ma。我们的SHRIMP U–Pb锆石年龄显示：（i）在Cleaverville组中带状铁层以下的黑色页岩层序内，分级的火山碎屑-长英质凝灰岩的年龄为（3 114±14）Ma。（ii）六十六山一带砂岩中最年轻的锆石，不整合地覆盖在富豪组的枕形玄武岩上，屈服年龄为3090-3060 Ma；（iii）四十四山成员砂岩中的锆石在3270 Ma和3020 Ma出现了两个年龄峰值。这样，Cleaverville组沉积在3114–3060 Ma处，并在3070–3050 Ma处变形（D ₁）。Cleaverville组的沉积年龄比以前的研究建议的年龄至少晚40–90 Myr，并且早于Prinsep造山带（3070–3050 Ma）。3020 Ma之后，D ₂导致在Cleaverville地区形成了一个区域性的走滑拉分盆地。低绿片岩相火山沉积岩仅分布在该盆地构造内。在皮尔巴拉地区，这种走滑形变与地壳尺度的左旋剪切形变（3000–2930 Ma）同步。