Mass spectrometric3He measurement in4He-rich phases: Techniques and limitations for cosmogenic3He dating of zircon, apatite, and titanite
نویسندگان
چکیده
منابع مشابه
Cosmogenic and nucleogenic He in apatite, titanite, and zircon
Cosmogenic He was measured in apatite, titanite, and zircon and cosmogenic Ne in quartz at 13 depth intervals in a 2.7-m long drill core in a Miocene ignimbrite from the Altiplano of Bolivia. All three He depth profiles as well as the Ne profile attenuate exponentially with depth, indicating that both of these isotopes are cosmogenic in origin with no significant contribution from other sources...
متن کاملapatite, and titanite
[1] Recent calibration studies have expanded the range of target minerals suitable for cosmogenic He dating to include U and Th‐rich phases such as zircon, apatite, and titanite. These minerals often contain large amounts of radiogenic He that present several analytical challenges for precise and accurate He determinations. In this paper we document the abundance sensitivity and changes in the ...
متن کاملU-Pb Zircon and Titanite Dating in Support of British Columbia Geological Survey Regional Mapping Studies
In this paper we report U-Pb zircon and titanite data and interpreted ages for sixteen rocks (Figure 1) sampled in support of regional mapping projects conducted by the British Columbia Geological Survey Branch during the midto late-1990s. Each sample is reported with geological context, interpretation of U-Pb data and significance of the date. The U-Pb results are also displayed on standard co...
متن کاملZircon, titanite, and apatite (U-Th)/He ages and age-eU correlations from the Fennoscandian Shield, southern Sweden
Craton cores far from plate boundaries have traditionally been viewed as stable features that experience minimal vertical motion over 100–1000 Ma time scales. Here we show that the Fennoscandian Shield in southeastern Sweden experienced several episodes of burial and exhumation from ~1800 Ma to the present. Apatite, titanite, and zircon (U-Th)/He ages from surface samples and drill cores constr...
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آب حاصل از بارش منبع تأمین نیازهای بی شمار جانداران به ویژه انسان است و هرگونه کاهش در کم و کیف آن مستقیماً حیات موجودات زنده را تحت تأثیر منفی قرار می دهد. نوسان سال به سال بارش از ویژگی های اساسی و بسیار مهم بارش های سالانه ایران محسوب می شود که آثار زیان بار آن در تمام عرصه های اقتصادی، اجتماعی و حتی سیاسی- امنیتی به نحوی منعکس می شود. چون میزان آب ناشی از بارش یکی از مولفه های اصلی برنامه ...
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ژورنال
عنوان ژورنال: Geochemistry, Geophysics, Geosystems
سال: 2010
ISSN: 1525-2027
DOI: 10.1029/2010gc003178