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首页> 外文期刊>Geosphere >Late Ottawan orogenic collapse of the Adirondacks in the Grenville province of New York State (USA): Integrated petrologic, geochronologic, and structural analysis of the Diana Complex in...
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Late Ottawan orogenic collapse of the Adirondacks in the Grenville province of New York State (USA): Integrated petrologic, geochronologic, and structural analysis of the Diana Complex in...

机译：纽约州格伦维尔省（美国）的Adirondack的晚渥太邦orenationic崩溃：迪亚纳综合体的综合岩土学，地理论和结构分析......

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Crustal-scale shear zones can be highly important but complicated orogenic structures, therefore they must be studied in detail along their entire length. The Carthage-Colton mylonite zone (CCMZ) is one such shear zone in the northwestern Adirondacks of northern New York State (USA), part of the Mesoproterozoic Grenville province. The southern CCMZ is contained within the Diana Complex, and geochemistry and U-Pb zircon geochronology demonstrate that the Diana Complex is expansive and collectively crystallized at 1164.3 ± 6.2 Ma. Major ductile structures within the CCMZ and Diana Complex include a northwest-dipping penetrative regional mylonitic foliation with north-trending lineation that bisects a conjugate set of mesoscale ductile shear zones. These ductile structures formed from the same 1060–1050 Ma pure shear transitioning to a top-to-the-SSE shearing event at ～700 °C. Other important structures include a ductile fault and breccia zones. The ductile fault formed immediately following the major ductile structures, while the breccia zones may have formed at ca. 945 Ma in greenschist facies conditions. Two models can explain the studied structures and other regional observations. Model 1 postulates that the CCMZ is an Ottawan orogeny (1090–1035 Ma) thrust, which was later reactivated locally as a tectonic collapse structure. Model 2, the preferred model, postulates that the CCMZ initially formed as a subhorizontal mid-crustal mylonite zone during collapse of the Ottawan orogen. With continued collapse, a metamorphic core complex formed and the CCMZ was rotated into is current orientation and overprinted with other structures.
机译：外壳剪切区域可以非常重要但具有复杂的造山结构，因此必须沿着整个长度进行详细研究它们。 Carthage-Colton Mylonite区（CCMZ）是纽约州北部（美国）西北部的一个这样的剪切区，其中部分是Mesoprotoiczoice Grenville省的一部分。南方CCMZ包含在戴安娜综合体内，地球化学和U-PB锆石地理学表明，戴安娜综合体是膨胀的，在1164.3±6.2 mA下集体结晶。 CCMZ和Diana Complex内的主要延性结构包括西北浸渍渗透区域肌叶，与北趋势的基础ateation分发了一种缀合物的Mescle延性剪切区。这些延展结构由与〜700℃的顶部到SSE剪切事件相同的1060-1050 mA纯剪切。其他重要结构包括延性故障和Breccia区。在主要延展结构之后立即形成的韧性故障，而Breccia区可能形成在CA.绿色党人面部条件945 mA。两种模型可以解释研究的结构和其他区域观察。模型1假定CCMZ是一种渥太邦Orogeny（1090-1035 mA）推力，后来作为构造塌陷结构本地重新激活。模型2，优选的模型，假设CCMZ最初在奥特兰造山因子的崩溃期间最初形成为脱噬细胞外中外髓鞘区。随着持续的崩溃，形成的变质芯复合物，CCMZ旋转到电流取向和与其他结构叠印。

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    《Geosphere》 |2020年第3期|共31页
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    Graham B. Baird;

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