CAJ | 학술논문

海山火山碎屑岩是水下爆发性火山作用的产物.南海盆两座海山上发现火山碎屑岩表明海山顶部曾经一度高于PCL(压力补偿深度).岩相学特征显示这些火山碎屑岩的胶结物主要为一混合相,包括粘土矿物和黑色铁质矿物等,这从一个侧面反映海山的正地形限制了粗粒外生碎屑到达海山顶部.岩石的单矿物组分、主量元素化学特征与同海山玄武质熔岩具有可比性,属碱性岩浆系列.计算获得海山平均最小下沉速率为0.06mm/年,最大可能达0.30mm/年.海山岩石的机械风化产物对周围海盆的沉积作用作出重要贡献.
해산화산쇄설암시수하폭발성화산작용적산물.남해분량좌해산상발현화산쇄설암표명해산정부증경일도고우PCL(압력보상심도).암상학특정현시저사화산쇄설암적효결물주요위일혼합상,포괄점토광물화흑색철질광물등,저종일개측면반영해산적정지형한제료조립외생쇄설도체해산정부.암석적단광물조분、주량원소화학특정여동해산현무질용암구유가비성,속감성암장계렬.계산획득해산평균최소하침속솔위0.06mm/년,최대가능체0.30mm/년.해산암석적궤계풍화산물대주위해분적침적작용작출중요공헌.
Volcaniclastic rock on seamount is the product of subaqueons explosive volcanism. The finding of volcaniclastic rocks from two seamounts in the South China Sea suggests that the top of seamounts once exceeded the pressure compensation level (PCL). Petrographic characteristics display that the cementing material mainly is a mixed phase including clay minerals and Fe-oxides, which, to one' s extent, reflects that it is difficult for coarse-size epiclastic debris to reach the top of seamount due to the obstruction of positive relief of seamount The characteristics of mineral compositions and major element of voicaniclastic rocks are comparable to those of alkali basaltic rocks from the same seamount, and these volcaniclastic rocks also belongs to alkali magma series based on mineralogy and major element data. The calculated minimal and maximal subsidence rates for seamounts in the South China Sea are 0. 06mm/year and 0.30mm/year, respectively. Physical weathering products of rocks from seamounts have a significant contributor to the adjacent basin.