Anatomy and evolution of a Mediterranean‐type fault bounded basin: the Lower Pliocene of the northern Crotone Basin (Southern Italy)
Anatomy and evolution of a Mediterranean‐type fault bounded basin: the Lower Pliocene of the northern Crotone Basin (Southern Italy)
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地中海型断层盆地的解剖与演化：克罗托内盆地北部（意大利南部）的上新统下层
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发表时间：
2004
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通讯作者：
G. Prosser
中科院分区：
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作者：
M. Zecchin;F. Massari;D. Mellere;G. Prosser
通过沉积学、地层学和构造分析，对卡拉布里亚弧（意大利南部）弧前盆地北克罗托内盆地的复杂发育进行了记录。这一地中海型断陷盆地由小型沉积中心组成，其共同特征是从陆相到浅海相的混合相。下上新世的Crotone盆地由近海泥灰岩（Cavalieri泥灰岩）组成，这些泥灰岩向上划分为850 m厚的浅海-陆相演替（Zinga组）。该演替被细分为三个主要的地层单元：津加1、津加2、津加3，以主要不整合面为界。津加1地层单元从卡瓦列里泥灰岩到三角洲和滨面沉积，后者组织成几个堆积的递进楔，显示出壮观的厚度变化和与盐核NE向生长褶皱和片状正断层有关的递进不整合。津加2地层单元记录了该地区的渐进和适度深化，其标志是在底部的河流沉积，随后是泻湖沉积，以及混合生物碎屑和硅质碎屑的岸面单元堆积，形成了米级的高频旋回。沉积受NE向同沉积正断层控制，该断层将盆地切割成一系列半地堑。上盘地层膨胀被下盘凝聚沉积所补偿。津加3地层单元沉积期间延续了伸展构造制度。在广义海侵阶段，局限于构造低洼的沉积导致了局部潮汐增强和沙波序列的发展。构造环境证明了弧前区的广义构造域。津加3地层单元顶部的角度不整合是区域性的，标志着与走滑运动有关的大规模构造阶段的激活。
The complex development of the northern Crotone Basin, a forearc basin of the Calabrian Arc (Southern Italy), has been documented by sedimentological, stratigraphic and structural analyses. This Mediterranean‐type fault bounded basin consists of small depocentres commonly characterized by a mix of facies that grades from continental to shallow marine. The lower Pliocene infill of the Crotone Basin consists of offshore marls (Cavalieri Marl) that grade upwards into a shallow‐marine to continental succession up to 850 m thick (Zinga Formation). The succession is subdivided into three main stratal units: Zinga 1, Zinga 2, Zinga 3 bounded by major unconformities. The Zinga 1 stratal unit grades from the Cavalieri Marl to deltaic and shoreface deposits, the latter organized into several stacked progradational wedges that show spectacular thickness changes and progressive unconformities related to salt‐cored NE‐trending growth folds and listric normal faults. The Zinga 2 stratal unit records a progressive and moderate deepening of the area, marked by fluvial sedimentation at the base, followed by lagoonal deposits and by a stacking of mixed bioclastic and siliciclastic shoreface units, organized into metre‐scale high‐frequency cycles. Deposition was controlled by NE‐trending synsedimentary normal faults that dissected the basin into a series of half‐grabens. Hangingwall stratigraphic expansion was compensated by footwall condensed sedimentation. The extensional tectonic regime continued during sedimentation of the Zinga 3 stratal unit. Deposition confined within structural lows during a generalized transgressive phase led to local enhancement of tidal flows and development of sand‐wave trains. The tectonic setting testifies the generalized structural domain of a forearc region. The angular unconformity at the top of the Zinga 3 stratal unit is regional, and marks the activation of a large‐scale tectonic phase linked to strike‐slip movements.