Petrogenesis of peralkaline rhyolites in an intra-plate setting: Glass House Mountains, southeast Queensland, Australia

过碱性岩 岩石成因 地球化学 地质学 分步结晶(地质学) 玄武岩 等时线 部分熔融 放射性核素 深熔 岩石学 地幔(地质学) 火山
作者
Fang Shao,Yaoling Niu,Marcel Regelous,Di‐Cheng Zhu
出处
期刊:Lithos [Elsevier]
卷期号:216-217: 196-210 被引量:36
标识
DOI:10.1016/j.lithos.2014.12.015
摘要

We report petrological and geochemical data on coeval trachybasalts, syenites with enclaves, trachytes, peralkaline rhyolites and peraluminous rhyolites from the Glass House Mountains–Maleny–Noosa area, southeast Queensland, Australia. This rock association and the unique characteristics of the peralkaline rhyolites offer convincing lines of evidence that the petrogenesis of the peralkaline rhyolites is a straightforward consequence of protracted fractional crystallization from basaltic melts of alkali-rich composition. Compared to the common peraluminous rhyolites elsewhere, the peralkaline rhyolites here are characterized by elevated abundances of most incompatible elements, especially the very high Nb (vs. Th) and Ta (vs. U), the very low Ba, Sr and Eu and the extremely high 87Sr/86Sr ratio. The high Nb and Ta are inherited from the parental alkali basaltic melts. The low Ba, Sr and Eu result from removal of plagioclase during the protracted fractional crystallization. These rocks altogether define a Rb–Sr isochron of ~ 28 Ma, which is similar to Ar–Ar age data on these rocks in the literature. The extremely high 87Sr/86Sr ratio of the peralkaline rhyolites (up to 1.88) is actually characteristic of peralkaline rhyolites because of extreme Sr (also Eu and Ba) depletion and thus the very high Rb/Sr ratio. That is, the Sr in these rocks is essentially radiogenic 87Sr accumulated from the 87Rb decay since the volcanism. We suggest that the petrogenesis of the peralkaline rhyolites from the Glass House Mountain area may be of general significance globally. The coeval peraluminous rhyolites apparently result from crustal anatexis in response to the basaltic magma underplating. The small “Daly Gap” exhibited in this rock association is anticipated during the protracted fractional crystallization from basaltic parent to the more evolved felsic varieties.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
大幅提高文件上传限制,最高150M (2024-4-1)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
刚刚
bkagyin应助科研通管家采纳,获得10
刚刚
深情安青应助科研通管家采纳,获得10
刚刚
香蕉觅云应助科研通管家采纳,获得10
刚刚
英俊的铭应助科研通管家采纳,获得10
刚刚
刚刚
科研通AI2S应助科研通管家采纳,获得10
刚刚
刚刚
传奇3应助科研通管家采纳,获得10
刚刚
李健应助科研通管家采纳,获得10
刚刚
刚刚
wanci应助科研通管家采纳,获得10
1秒前
PYT完成签到 ,获得积分10
1秒前
爆米花应助科研通管家采纳,获得10
1秒前
丘比特应助科研通管家采纳,获得10
1秒前
1秒前
1秒前
科研通AI2S应助科研通管家采纳,获得10
1秒前
一一应助科研通管家采纳,获得10
1秒前
一一应助科研通管家采纳,获得10
1秒前
天天快乐应助科研通管家采纳,获得10
1秒前
ll完成签到,获得积分10
1秒前
1秒前
李爱国应助科研通管家采纳,获得10
1秒前
乐乐应助科研通管家采纳,获得10
1秒前
隐形曼青应助科研通管家采纳,获得10
1秒前
领导范儿应助科研通管家采纳,获得10
1秒前
元谷雪应助科研通管家采纳,获得10
2秒前
科研通AI2S应助科研通管家采纳,获得10
2秒前
2秒前
2秒前
4秒前
6秒前
Jm完成签到,获得积分20
7秒前
梦桃完成签到 ,获得积分10
7秒前
曾经的苑博完成签到,获得积分10
8秒前
端庄的魔镜完成签到 ,获得积分10
11秒前
小霸王完成签到 ,获得积分10
13秒前
13秒前
13秒前
高分求助中
歯科矯正学 第7版(或第5版) 1004
Smart but Scattered: The Revolutionary Executive Skills Approach to Helping Kids Reach Their Potential (第二版) 1000
Semiconductor Process Reliability in Practice 720
PraxisRatgeber: Mantiden: Faszinierende Lauerjäger 700
GROUP-THEORY AND POLARIZATION ALGEBRA 500
Mesopotamian divination texts : conversing with the gods : sources from the first millennium BCE 500
Days of Transition. The Parsi Death Rituals(2011) 500
热门求助领域 (近24小时)
化学 医学 生物 材料科学 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 基因 遗传学 催化作用 物理化学 免疫学 量子力学 细胞生物学
热门帖子
关注 科研通微信公众号,转发送积分 3227991
求助须知:如何正确求助?哪些是违规求助? 2875925
关于积分的说明 8193014
捐赠科研通 2543101
什么是DOI,文献DOI怎么找? 1373445
科研通“疑难数据库(出版商)”最低求助积分说明 646756
邀请新用户注册赠送积分活动 621243