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首页> 外文期刊>Journal of Asian earth sciences >Tectonic and stratigraphic evolution of the Sarulla graben geothermal area, North Sumatra, Indonesia
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Tectonic and stratigraphic evolution of the Sarulla graben geothermal area, North Sumatra, Indonesia

机译：印度尼西亚北苏门答腊省萨鲁拉a陷地热区的构造和地层演化

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摘要

The Sarulla graben is a composite Plio-Pleistocene basin developed along the northwest striking, dextral-slip Sumatra fault in a region where the fault coincides with the Sumatra volcanic arc. Offset of the 0.27 +- 0.03 Ma Tor Sibohi rhyodacite dome by an active strand of the Sumatra fault, the Tor Sibohi fault (TSF), indicates a slip rate of about 9 mm/y. This value is lower than previous regional estimates of ～ 25 -30 mm/y for Holocene slip on the Sumatra fault determined from stream offsets in the Taratung region. This discrepancy may be due to (1) a difference between Holocene and late Quaternary rates of slip and (2) additional slip on other faults in the Sarulla area. Since the magnitude of undated stream offsets along the TSF in the Sarulla area is similar to those in the Taratung area, the discrepancy is likely to be due largely to a change in slip rate over time. Within the Sarulla area, major volcanic centers include the Sibualbuali stratavolcano (～ 0.7-0.3 Ma), the Hopong caldera (～ 1.5 Ma), and the Namora-I-Langit dacitic dome field (0.8-0.1 Ma). These centers generated the majority of the ash-flow tuffs and tuffaceous sediments filling the Sarulla graben, and appear to have been localized by structural features related to the Sumatra fault zone. Four geothermal systems within the Sarulla area are closely linked to major faults and volcanic centers. In three of the systems, reservoir permeability is clearly dominated by specific structures within the Sumatra fault system. In the fourth geothermal system, Namora-I-Langit geothermal field, permeability may be locally influenced by faults, but highly permeable fractures are widely distributed.
机译：Sarulla en陷是一个复合的上新世盆地，沿着断层与苏门答腊火山弧重合的西北震荡，右旋苏门答腊断裂带发育。苏门答腊断裂的活动带（Tor Sibohi断裂（TSF））偏移0.27±0.03 Ma Tor Sibohi的流纹岩穹顶，表明滑移速率约为9 mm / y。该值低于先前的估计值，该估计值是根据塔拉通地区的河流偏移确定的苏门答腊断裂上全新世滑移的〜25 -30 mm / y。这种差异可能是由于（1）全新世和晚第四纪滑动速率之间的差异，以及（2）Sarulla地区其他断层的额外滑动。由于Sarulla地区沿TSF的未平流偏移量的大小与Taratung地区的相类似，因此差异很大可能是由于滑移率随时间的变化。在Sarulla地区，主要的火山中心包括Sibualbuali地层火山（〜0.7-0.3 Ma），Hopong破火山口（〜1.5 Ma）和Namora-I-Langit的大乳穹顶田（0.8-0.1 Ma）。这些中心产生了大部分的灰烬凝灰岩和含沙质泥质的凝灰质沉积物，似乎已被与苏门答腊断裂带有关的结构特征所局限。 Sarulla地区内的四个地热系统与主要断层和火山中心紧密相连。在这三个系统中，苏门答腊断层系统内的特定结构显然会控制储层的渗透率。在第四个地热系统，Namora-I-Langit地热田中，渗透率可能受到断层的局部影响，但高渗透性裂缝却分布广泛。

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