A        <fc xmlns='http://www.wiley.com/namespaces/wiley'>TEM</fc>TEM        study of exsolution in Ca‐rich pyroxenes from the Paris and Renazzo chondrites: Determination of type I chondrule cooling rates

Cuvillier Priscille; Chaumard No?l; Leroux Hugues; Zanda Brigitte; Hewins Roger H.; Jacob Damien; Devouard Bertrand

摘要

Abstract > We conducted a transmission electron microscope study of the exsolution microstructures of Ca‐rich pyroxenes in type I chondrules from the Paris <fc>CM</fc> and Renazzo <fc>CR</fc> carbonaceous chondrites in order to provide better constraints on the cooling history of type I chondrules. Our study shows a high variability of composition in the augite grains at a submicrometer scale, reflecting nonequilibrium crystallization. The microstructure is closely related to the local composition and is thus variable inside augite grains. For compositions inside the pyroxene miscibility gap, with a wollastonite (Wo) content typically below 40?mole%, the augite grains contain abundant exsolution lamellae on (001). For grain areas with composition close to Wo <sub>40</sub> , a modulated texture on (100) and (001) is the dominant microstructure, while areas with compositions higher than Wo <sub>40</sub> do not show any exsolution microstructure development. To estimate the cooling rate, we used the spacing of the exsolution lamellae on (001), for which the growth is diffusion controlled and thus sensitive to the cooling rate. Despite the relatively homogeneous microstructures of augite grains with Wo??35?mole%, our study of four chondrules suggests a range of cooling rates from ~10 to ~1000?°C?h ?1 , within the temperature interval 1200–1350?°C. These cooling rates are comparable to those of type II chondrules, i.e., 1–1000?°C?h ?1 . We conclude that the formation of type I and II chondrules in the proto‐solar nebula was the result of a common mechanism. </abstract> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> <div class="translation abstracttxt"> <span class="zhankaihshouqi fivelineshidden" id="abstract"> <span>机译：</span><abstract xmlns =“http://www.wiley.com/namespaces/wiley”type =“main”xml：id =“maps13032-abs-0001”XML：lang =“en”> <标题类型=“main”>抽象</ title> > 我们进行了来自巴黎的I型软骨中的Ca-富含富集型富甲烯的输电微观结构的透射电子显微镜研究 <FC> CM </ FC> 和胸面 <FC> CR </ FC> 碳质心脏是为了提供更好的限制I型Chondrules的冷却史。我们的研究表明，在亚模量尺度上的增强晶体中的组合物的高可变性，反映了非核状结晶。微观结构与局部组合物密切相关，因此可以在亚铁颗粒内变化。对于在冰氟混溶性间隙内的组合物中，硅灰石（WO）含量通常低于40Ω·摩尔％，延长颗粒含有丰富的exsolution Lamellae（001）。适用于与WO接近的构图的谷物区域 <sub> 40 </ sub> ，在（100）和（001）上的调制纹理是显微组织，而组合物高于WO的区域 <sub> 40 </ sub> 不要显示任何exolution微观结构开发。为了估计冷却速率，我们使用exsolution薄片的间隔（001），生长是扩散控制的，因此对冷却速率敏感。尽管使用WOβ谷粒的相对均匀的微观结构，但＆？35？35？摩尔％，我们对四种软骨抑制的研究表明，从〜10至〜1000？°C的冷却速率范围？1 </ sup> ，在温度间隔内1200-1350？°C。这些冷却速率与II型软骨质量相当，即1-1000°C？H. ？1 </ sup> 。我们得出结论，在原始太阳明星云中的I和II骨髓内部的形成是常见机制的结果。 </ p> </摘要> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> </div> <div class="record"> <h2 class="all_title" id="enpatent33" >著录项</h2> <ul> <li> <span class="lefttit">来源</span> <div style="width: 86%;vertical-align: text-top;display: inline-block;"> <a href='/journal-foreign-24922/'>《Meteoritics & planetary science》</a> <b style="margin: 0 2px;">|</b><span>2018年第3期</span><b style="margin: 0 2px;">|</b><span>共11页</span> </div> </li> <li> <div class="author"> <span class="lefttit">作者</span> <p id="fAuthorthree" class="threelineshidden zhankaihshouqi"> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Cuvillier Priscille&option=202" target="_blank" rel="nofollow">Cuvillier Priscille;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Chaumard No?l&option=202" target="_blank" rel="nofollow">Chaumard No?l;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Leroux Hugues&option=202" target="_blank" rel="nofollow">Leroux Hugues;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Zanda Brigitte&option=202" target="_blank" rel="nofollow">Zanda Brigitte;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Hewins Roger H.&option=202" target="_blank" rel="nofollow">Hewins Roger H.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Jacob Damien&option=202" target="_blank" rel="nofollow">Jacob Damien;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Devouard Bertrand&option=202" target="_blank" rel="nofollow">Devouard Bertrand;</a> </p> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zkzz" style="display: none;">展开▼</span> </div> </li> <li> <div style="display: flex;"> <span class="lefttit">作者单位</span> <div style="position: relative;margin-left: 3px;max-width: 639px;"> <div class="threelineshidden zhankaihshouqi" id="fOrgthree"> <p>Unité Matériaux et TransformationsUniversité Lille 1 and CNRSF‐59655 Villeneuve d'Ascq France;</p> <p>Institut de Minéralogie de Physique des Matériaux et de Cosmochimie (IMPMC)Sorbonne Université75005 Paris France;</p> <p>Unité Matériaux et TransformationsUniversité Lille 1 and CNRSF‐59655 Villeneuve d'Ascq France;</p> <p>Institut de Minéralogie de Physique des Matériaux et de Cosmochimie (IMPMC)Sorbonne Université75005 Paris France;</p> <p>Institut de Minéralogie de Physique des Matériaux et de Cosmochimie (IMPMC)Sorbonne Université75005 Paris France;</p> <p>Unité Matériaux et TransformationsUniversité Lille 1 and CNRSF‐59655 Villeneuve d'Ascq France;</p> <p>Aix‐Marseille Université13545 Aix en Provence France;</p> </div> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zhdw" style="display: none;">展开▼</span> </div> </div> </li> <li > <span class="lefttit">收录信息</span> <span style="width: 86%;vertical-align: text-top;display: inline-block;"></span> </li> <li> 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A TEMTEM study of exsolution in Ca‐rich pyroxenes from the Paris and Renazzo chondrites: Determination of type I chondrule cooling rates

摘要