COVERED DEPTH OF SUPERFICIAL MAGMA CHAMBER ON THE NORTHERN SLOPE OF TIANCHI VOLCANO IN CHANGBAI MOUNTAIN BASED ON BOREHOLE TEMPERATURE
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摘要:
长白山火山区地壳热结构尚未建立, 目前基于地球物理探测手段获得的天池火山浅部岩浆房赋存深度存在差异. 通过对天池火山北坡CZK07钻孔测温情况的研究, 在资料评价与地温梯度计算的基础上, 结合全新世岩浆房温度资料, 估算了北坡浅部岩浆房的赋存深度. CZK07钻孔位于地球物理探测所推测的浅部岩浆房正上方, 靠近历史时期火山喷发火口, 在孔深约610 m处地温较高且稳定(102.5~106.8℃). 连续测温资料显示, 钻孔地温随深度呈一次正相关变化, 地温梯度主要变化于134~178℃/km之间(平均为153℃/km), 可大致代表浅部岩浆房上覆地壳的地温梯度. 基于前人浅部岩浆房的温度研究, 本次定量估算的天池火山北坡浅部岩浆房的赋存深度, 为天池水面下5.25~7.21 km, 与地球物理探测的反演结果相近.
Abstract:The crustal thermal structure in Changbaishan volcanic area has not been established yet and there are differences about the covered depth of superficial magma chamber in Tianchi Volcano by means of geophysical exploration. The covered depth of superficial magma chamber on the northern slope of Tianchi Volcano is estimated through the temperature measurement of CZK07 borehole, data evaluation and geothermal gradient calculation, combined with the temperature data of Holocene magma chamber. The CZK07 borehole is located right above the superficial magma chamber speculated by geophysical exploration, close to the historic crater of volcanic eruption, with relatively high and stable temperature (102.5-106.8℃) at the depth about 610 m. The continuous temperature measurement data indicates that the borehole temperature shows a positive correlation with depth, with the geothermal gradient ranging from 134 to 178℃/km (averagely 153℃/km), roughly representing the geothermal gradient of the overlying crust of superficial magma chamber. Based on previous temperature studies of superficial magma chamber, the covered depth of superficial magma chamber on the northern slope of Tianchi Volcano is estimated to be 5.25-7.21 km below the surface of Tianchi Lake, which is similar to the inversion results of geophysical exploration.
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表 1 2013年6月CZK07孔井温记录表
Table 1. Records of temperatures vs. depths in CZK07 borehole in June 2013
14日 21日 23日 30日 深度/m 温度1/℃ 温度2/℃ 深度/m 温度/℃ 深度/m 温度1/℃ 温度2/℃ 深度/m 温度1/℃ 温度2/℃ 610 102.5 104 525 100.2 613 98.9 106.8 550 97.3 560 97.12 96.1 475 85.6 563 80.6 500 91.3 510 95 94.2 425 83.6 513 118 92.1 450 77.2 460 86.9 86.6 375 118 463 72.2 77.2 400 76.2 410 85.8 85.6 325 76.2 413 79.4 79.3 350 68.7 360 74.2 74 275 68.5 363 77.6 76.8 300 74.4 68.2 310 69.5 69.2 225 57.1 313 69.8 250 62.7 55.6 260 62.5 62.3 175 45.6 263 59.1 200 47.1 51.9 210 51.5 49.7 125 32.8 213 50.6 150 36.6 160 44.5 44.1 75 21.5 163 35.2 100 26.8 110 34 37 113 18.4 50 17.1 60 28.5 29 63 12.2 0 13.9 
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表 2 天池火山北坡浅部岩浆房深度计算
Table 2. Covered depth of superficial magma chamber on the northern slope of Tianchi Volcano
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