Stone-line formation processes documented by in situ-produced 10Be distribution, Jardim River basin, DF, Brazil
Stone-line formation processes documented by in situ-produced 10Be distribution, Jardim River basin, DF, Brazil
复制标题
巴西 DF 雅丁河流域现场生产的 10Be 分布记录了石线形成过程
DOI：
10.1016/j.epsl.2004.02.033
复制
发表时间：
2004
影响因子：
5.3
通讯作者：
M. Assad
中科院分区：
文献类型：
--
作者：
R. Braucher;C. V. Lima;D. Bourlès;J. Gaspar;M. Assad
为了量化该地区的景观演化过程，从巴西联邦区贾迪姆河盆地的一个石英脉及其相连的石线上采集的石英样品中测量了原位产生的宇宙成因10Be(t1/2=1.5Myr)的浓度。10Be浓度沿石英脉呈指数递减，而沿远离石英脉的石线呈系统增加，表明为原地发育。有两个模型可以估计侧向位移速率。假设样品深度和产量不变的塞子模型和假设样品深度和产量随时间变化的埋藏模型分别产生37±5和68±6 m Myr−1的侧向位移速率。
Concentrations of in situ-produced cosmogenic10Be (T1/2=1.5 Myr) were measured in quartz samples from a quartz vein and its connected stone line from the Jardim River basin, Distrito Federal, Brazil, in order to quantify the processes involved in the landscape evolution of that region. The exponential decrease of the10Be concentrations along the quartz vein, as well as their systematic increase along the stone-line away from the quartz vein, suggests an autochthonous development. Two models allow to estimate the lateral displacement rate. A plugs model assuming that the sample depth, and hence the production rate, is constant, and a burial model assuming that the sample depth, and hence the production rate, varies through time, yield lateral displacement rate of 37±5 and 68±6 m Myr−1, respectively.