Geochronology of the Navajo‐Hopi Diatremes, Four Corners Area
Geochronology of the Navajo‐Hopi Diatremes, Four Corners Area
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纳瓦霍霍皮人 Diatremes 的地质年代学，四个角落地区
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发表时间：
1971
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通讯作者：
C. Naeser
中科院分区：
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作者：
C. Naeser
本文利用裂变径迹法测定了科罗拉多高原四角地区前寒武纪捕虏体中的副矿物年龄。纳瓦霍侵入场的四个diatremes和两个脉岩中的包裹体磷灰石完全退火前或侵入过程中。这些包裹体中的球粒和锆石都是完全退火或部分退火的。四个金伯利岩diatremes（Buell公园，石榴石岭。摩西岩和骡耳）是3130万± 900万年，两个岩脉（Mitten Rock和Ship Rock）的平均年龄为31.5±1.4百万年。霍皮丘火山区的斗兽场和Hoskietso monchiquite diatremes的年龄为2.1±0.2百万年。和5.5±1.1百万年，分别石榴石岭地隙不同捕虏体的不一致的锆石和锆石年龄表明，退火是由于埋藏，而不是地隙的初始温度。
Accessory minerals from Precambrian xenoliths found in the diatremes and dikes of the Four Corners area of the Colorado Plateau were dated by means of fission tracks. Apatite from inclusions in four diatremes and two dikes in the Navajo intrusive field was completely annealed before or during intrusion. Sphene and zircon from these same inclusions were completely to partly annealed. The average age for the four kimberlitic diatremes (Buell Park, Garnet Ridge. Moses Rock, and Mule Ear) is 31.3±0.9 m.y., and the average age for the two minette dikes (Mitten Rock and Ship Rock) is 31.5±1.4 m.y. The Coliseum and Hoskietso monchiquite diatremes in the Hopi Buttes volcanic field have ages of 2.1±0.2 m.y. and 5.5±1.1 m.y., respectively. Discordant sphene and zircon ages from different xenoliths at the Garnet Ridge diatreme suggest that the annealing was due to burial rather than the initial temperatures of the diatreme.