I-Xe ages of enstatite chondrites

I-Xe ages of enstatite chondrites
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顽辉石球粒陨石的 I-Xe 年龄

DOI:
10.1016/j.gca.2015.11.014
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发表时间:
2016
影响因子:
5
通讯作者:
Ott U.
Ott U.
中科院分区:
地球科学1区
文献类型:
--
作者:
Hopp J;Trieloff M;Ott U.

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为了阐明顽辉石球粒陨石母体的早期热历史,我们测定了顽辉石球粒陨石的129i - 129xe整体岩石年龄(5 EH, 2 EL, 1 EH撞击熔体)相对于浅水参考陨石(4562.3±0.4 Ma,误差均为1σ)。两个EL6球粒陨石的I-Xe年龄(LON 94100:−4.38±0.60 Ma, Neuschwanstein:−3.87±0.73 Ma,负号表示年龄小于浅水区)与其他EL6球粒陨石的数据吻合良好。LON 94100在较低温度下显示出第二等时线,相当于−5.25±1.17 Ma,这可能反映了在顺序冷却过程中各自载流子相的不同保留温度。顽辉石球粒陨石Abee (EH4), Indarch (EH4), EET 96135 (EH4/5)和St. Marks (EH5)的I-Xe年龄范围为+0.57±1.05 Ma (EET 96135 #1)至- 0.45±0.72 Ma (Abee),再次与先前报道的EH球粒陨石年龄一致。只有圣马可的年龄与以前报道的更年轻的年龄有很大的不同,现在更符合EH氏族的其他成员。EH3球粒陨石Sahara 97096最年轻的I-Xe年龄为- 7.87±0.46 Ma,明显低于EH球粒陨石(包括其他EH3s)的I-Xe年龄。由于I-Xe系统在长辉石中的保留温度明显很高(估计为800°C),这一年轻的年龄意味着I-Xe系统后来被严重的热事件(可能是撞击引起的)重置。EH撞击熔体LAP 02225记录了一个类似的年轻热事件。虽然不能建立等时线关系,但数据的明显I-Xe年龄范围为+5 ~ +15 Ma,与撒哈拉97096相似。总的来说,EH球粒陨石母体经历了一个由撞击扰动和母体变质作用复杂相互作用决定的热历史。
In order to elucidate the early thermal history of enstatite chondrite parent bodies we determined129I–129Xe whole rock ages of enstatite chondrites (5 EH, 2 EL, one EH impact melt) relative to the Shallowater reference meteorite (4562.3 ± 0.4 Ma, all errors are 1σ). I–Xe ages of both EL6 chondrites (LON 94100: −4.38 ± 0.60 Ma and Neuschwanstein: −3.87 ± 0.73 Ma − negative sign indicates ages younger than Shallowater) agree well with data of other EL6 chondrites. LON 94100 displayed a second isochron at lower temperatures equivalent to a younger age of −5.25 ± 1.17 Ma, perhaps reflecting different retention temperatures of respective carrier phases during sequential cooling. The enstatite chondrites Abee (EH4), Indarch (EH4), EET 96135 (EH4/5) and St. Marks (EH5) encompass a I–Xe age range of +0.57 ± 1.05 Ma (EET 96135 #1) to −0.45 ± 0.72 Ma (Abee), again in agreement with previously reported ages of EH chondrites. Only the age of St. Marks differs strongly from previously reported younger ages, now being more in accordance with other members of the EH clan. The EH3 chondrite Sahara 97096 showed the youngest I–Xe age of −7.87 ± 0.46 Ma distinctly younger than other I–Xe ages of EH chondrites, including other EH3s. Due to the apparent high retention temperature of the I–Xe system in enstatite (estimated >800 °C) this young age implies a later resetting of the I–Xe system by a severe thermal, likely impact-induced, event. The EH impact melt LAP 02225 records a similarly young thermal event. Though no isochron relationship could be established, the data fall within an apparent I–Xe age range of +5 to +15 Ma, similar to Sahara 97096. Overall, EH chondrite parent body experienced a thermal history determined by a complex interplay between impact disturbances and parent body metamorphism.
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