I-Xe ages of enstatite chondrites
I-Xe ages of enstatite chondrites
复制标题
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.
中科院分区:
文献类型:
--
作者:
Hopp J;Trieloff M;Ott U.
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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影响因子:
2.2
作者:
Hopp J;Trieloff M;Korochantseva E.K;Buykin A.I.
通讯作者:
Buykin A.I.
DOI:
--
发表时间:
2005
期刊:
影响因子:
--
作者:
G. Holland;J. Bridges;A. Busfield;T. Jeffries;G. Turner;J. Gilmour
通讯作者:
J. Gilmour
DOI:
--
发表时间:
2004
期刊:
影响因子:
--
作者:
C. Hohenberg;O. Pravdivtseva;A. Meshik
通讯作者:
A. Meshik
DOI:
--
发表时间:
1982
期刊:
影响因子:
--
作者:
M. Caffee;C. Hohenberg;F. Horz;B. Hudson;B. M. Kennedy;F. Podosek;T. Swindle
通讯作者:
T. Swindle
影响因子:
5
作者:
F. Podosek
通讯作者:
F. Podosek