干旱区生态环境知识资源中心(Arid): The SPICE project: Production rates of cosmogenic Ne-21, Be-10, and C-14 in quartz from the 72 ka SP basalt flow, Arizona, USAu

Arid

DOI	10.1016/j.quageo.2019.101019
	The SPICE project: Production rates of cosmogenic Ne-21, Be-10, and C-14 in quartz from the 72 ka SP basalt flow, Arizona, USAu
	Fenton, Cassandra R.1,2,3; Niedermann, Samuel 3; Dunai, Tibor 2; Binnie, Steven A.2
通讯作者	Fenton, Cassandra R.
来源期刊	QUATERNARY GEOCHRONOLOGY
ISSN	1871-1014
EISSN	1878-0350
出版年	2019
卷号	54
英文摘要	The SP lava flow is a quartz-, olivine- and pyroxene-bearing basalt with an Ar-40/Ar-39 age of 72 +/- 4 ka (2 sigma). The flow is preserved in the desert climate of northern Arizona, USA. Its unweathered appearance and the lack of soil development indicate it has undergone negligible erosion and/or burial, making it an ideal site for direct calibration of cosmogenic nuclide production rates. Cross-calibrated production rates and production rate ratios for cosmogenic Ne-21, Be-10, and C-14 have been determined from SP flow quartz. Production rate ratios for Ne-21/Be-10, Ne-21/C-14, and C-14/Be-10 are based on the total, local production rates of each cosmogenic nuclide, independent of scaling models, and have error-weighted means (+/- 2 sigma uncertainty) of 4.44 +/- 0.32, 1.43 +/- 0.10, and 2.85 +/- 0.21, respectively. Error-weighted mean, sea-level, high latitude (SLHL) total reference production rates of Ne-21, Be-10, and C-14 are 17.0 +/- 1.1, 3.84 +/- 0.27, and 11.2 +/- 0.6 at/g/yr (2 sigma), respectively, using time-independent Lal (1991)/Stone (2000) (St) scaling factors. St scaled spallogenic Be-10 and C-14 rates are 3.73 +/- 0.26 and 9.2 +/- 0.6 at/g/yr, respectively. Ne-21 and Be-10 production rates are integrated over the past 72 ka, whereas C-14 production rates are integrated over 25 ka, the time at which SP flow quartz has reached saturation with respect to C-14. These rates overlap within 2 sigma uncertainty with other St-scaled production rates in the literature, including the total reference SLHL Ne-21 production rate of Niedermann (2000), which is revised in this paper to 16.8 +/- 3.3 at/g/yr (2 sigma; St scaling) to reflect a recent change in age control at the Sierra Nevada sites. All SLHL production rates are lower if time-dependent Sf, Sa, and Lm scaling factors are used. For example, error-weighted mean, sea-level, high latitude (SLHL) total reference production rates for Be-10 as calculated in the CREp online calculator range from 3.49 +/- 0.23 to 3.74 +/- 0.25 at/g/yr (2 sigma), using time-dependent Lm scaling factors. Commonly used SLHL Be-10 and C-14 production rates in the literature were calibrated on surfaces that have been exposed to cosmic rays for less than 20 ka. Between 20 and 50 ka, the geomagnetic field is proposed to have been weaker than it is today. Production rates of cosmogenic nuclides increase during periods of weaker geomagnetic field strength. However, our study finds no measureable difference between St-scaled production rates of cosmogenic Ne-21 and Be-10 over the past 20 ka and St-scaled Ne-21 and Be-10 production rates over the past 72 ka. As such, the study suggests that Ne-21 and Be-10 production rates in quartz were not significantly greater during the proposed period of decreased magnetic strength from 20 to 50 ka.
英文关键词	Cosmogenic nuclide production rates Ne-21 Be-10 (14)c Quartz Geomagnetic field SP lava flow
类型	Article
语种	英语
国家	USA ; Germany
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000495496100006
WOS关键词	PRODUCTION-RATE CALIBRATION ; IN-SITU C-14 ; ACCELERATOR MASS-SPECTROMETRY ; FRANCISCO VOLCANIC FIELD ; SURFACE EXPOSURE AGES ; GEOMAGNETIC-FIELD ; DRY VALLEYS ; TRANSANTARCTIC MOUNTAINS ; TERRESTRIAL ROCKS ; DENUDATION RATES
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
EI主题词	2019-10-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/310249
作者单位	1.Colorado Mesa Univ, Dept Phys & Environm Sci, Grand Junction, CO 81501 USA; 2.Univ Cologne, Inst Geol & Mineral, D-50674 Cologne, Germany; 3.Deutsch GeoForschungsZentrum, D-14473 Potsdam, Germany
推荐引用方式 GB/T 7714	Fenton, Cassandra R.,Niedermann, Samuel,Dunai, Tibor,et al. The SPICE project: Production rates of cosmogenic Ne-21, Be-10, and C-14 in quartz from the 72 ka SP basalt flow, Arizona, USAu[J],2019,54.
APA	Fenton, Cassandra R.,Niedermann, Samuel,Dunai, Tibor,&Binnie, Steven A..(2019).The SPICE project: Production rates of cosmogenic Ne-21, Be-10, and C-14 in quartz from the 72 ka SP basalt flow, Arizona, USAu.QUATERNARY GEOCHRONOLOGY,54.
MLA	Fenton, Cassandra R.,et al."The SPICE project: Production rates of cosmogenic Ne-21, Be-10, and C-14 in quartz from the 72 ka SP basalt flow, Arizona, USAu".QUATERNARY GEOCHRONOLOGY 54(2019).