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Nonvolcanic Carbon Dioxide Emission at Continental Rifts: The Bublak Mofette Area, Western Eger Rift, Czech Republic

机译：大陆裂谷中的非寄生二氧化碳排放：捷克共和国西部埃格拉克·雷夫特区

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This study presents the results of gas flux measurements of cold, mantle-derived CO2 release at the Bublák mofette field (BMF), located inside of the N-S directed Počátky Plesná fault zone (PPFZ). The PPFZ is presently seismically active, located in the eastern part of the Cheb Basin, western Eger Rift, Central Europe. The goal of the work was to identify the linkage between tectonics and gas flux. The investigated area has a size of 0,43 km2 in which 1.115 locations have been measured. Besides classical soil CO2 gas flux measurements using the closed chamber method (West Systems), drone-based orthophotos were used in combination with knowledge of plant zonation to find zones of high degassing in the agriculturally unused part of the BMF. The highest observed soil CO2 gas flux is 177.926,17 g m-2 d-1, and the lowest is 0,28 g m-2 d-1. Three statistical methods were used for the calculation of the gas flux: arithmetic mean, kriging, and trans-Gaussian kriging. The average CO2 soil degassing of the BMF is 30 t d-1 for an area of 0,43 km2. Since the CO2 soil degassing of the Hartoušov mofette field (HMF) amounts to 23 t d-1 for an area of 0,35 km2, the average dry degassing values of the BMF and HMF are in the same magnitude of order. The amount of CO2 flux from wet mofettes is 3 t d-1 for the BMF and 0,6 t d-1 for the HMF. It was found that the degassing in the BMF and HMF is not in accordance with the pull-apart basin interpretation, based on the direction of degassing as well as topography and sediment fill of the suggested basins. En-echelon faults inside of the PPFZ act as fluid channels to depth (CO2 conduits). These structures inside the PPFZ show beginning faulting and act as tectonic control of CO2 degassing.
机译：本研究介绍了在BublákMofette场（BMF）内的冷，地幔衍生的CO2释放的气体通量测量结果，位于N-S定向PočátkyPlesná断层区（PPFZ）内部。 PPFZ目前正在地震活跃，位于Cheb盆地的东部，中欧中部埃夫斯河口的东部。该工作的目标是识别构造和气体通量之间的联系。调查区域的尺寸为0,43公里，其中已经测量1.115个位置。除了使用闭合腔室方法（西系统）的经典土壤CO2气体通量测量外，无人机的原子孔与植物区划的知识结合使用，以发现在农业上未使用的BMF中的高脱气区域。最高观察到的土壤二氧化碳气体通量为177.926,17g m-2 d-1，最低为0.28g m-2 d-1。三种统计方法用于计算气体通量：算术平均值，克里格和跨高斯克里格。 BMF的平均二氧化碳土壤脱气为30td-1，面积为0.43 km2。由于Hartoušovmofette字段（HMF）的CO 2土壤脱气达23吨d-1 0.35平方公里，该BMF的平均干燥脱气的值的区域和HMF是在顺序的相同幅度。来自湿法发出的CO 2通量的量为HMF的BMF和0.6 T-1的3 T D-1。结果发现，基于脱气的方向以及建议盆地的地形和沉积物填充，BMF和HMF中的脱气不符合拉伸盆地解释。 PPFZ内部的en-echelon故障充当流体通道深度（二氧化碳导管）。 PPFZ内部的这些结构显示出故障并充当CO2脱气的构造控制。

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