Early Neogene biochemostratigraphy of Pohang Basin: a paleoceanographic response to the early opening of the Sea of Japan (East Sea)

Distinct sedimentary processes reflected in the isotopic signatures of dolomitic concretions in the Miocene Pohang Basin (southwestern East Sea)

“…Non-marine to shallow marine sedimentation occurred together with extensive volcanism during this period (Son et al, 2005). At about 17 Ma, the Pohang area began to subside rapidly, from inner neritic (<50 m deep) to middle-to-lower bathyal depths (>500 m deep; Ingle, 1992;Kim, 1999). Several fan deltas began to form along the western basin margin (Hwang et al, 1995;Sohn et al, 2001;Sohn and Son, 2004).…”

“…Sequence stratigraphic analysis (Sohn et al, 2001) and paleontological studies (Shin, 1981;Kim, 1990;Bak et al, 1996;Kim, 1999) suggest that the siliceous mudstones were deposited during the late Middle Miocene when global sea level was falling (Haq et al, 1988) and the Pohang Basin began to be uplifted because of tectonic inversion (Ingle, 1992;Jolivet et al, 1994). In spite of falling relative sea level during the late Middle Miocene, prevalent hemipelagic to pelagic sedimentation of terrigenous and biogenous materials suggests low suspension fallout by particle settling in the Pohang Basin because of the termination of coarse-grained sediments supplied through alluvial feeder systems at the western basin margin.…”

Stratigraphic Implication of the Daljeon Basalt in the Miocene Pohang Basin, SE Korea

“…2). 달전현무암은 Tateiwa (Kim, 1965;Yoon, 1975, You et al, 1986Kim, 1990;Yi and Yun, 1995;Kim, 1999 (Kim and Kang, 1989;Son and Kim, 1996;Son et al 2013). 또한 전자는 17~20 Ma의 비알칼리 계 열의 칼크-알칼리 현무암인 반면, 후자는 정확한 연대 에 대해서 논란이 있으나 알칼리 계열 현무암의 지화 학적 특성을 보인다 Shimazu et al, 1990;Song et al, 1998;Shim et al, 2011;Choi et al, 2013 (Han et al, 1987;Kim, 1992;Yoon and Chough, 1993;Choi, 2006 와 거의 평행한 암상으로 분기된 양상을 보여주고 있 어 (Fig.…”

Evolution of the Miocene Waup Basin, SE Korea, in response to dextral shear along the southwestern margin of the East Sea (Sea of Japan)

“…1b). They have long been regarded as containing important clues to the back-arc opening of the East Sea (Chinzei, 1991;Ingle, 1992;Jolivet et al, 1994;Yoon and Chough, 1995;Yoon, 1997;Kim, 1999;Lee et al, 1999b).…”

“…(b) Regional geological map of the southeastern Korean Peninsula, showing the distribution of the Miocene sedimentary basins and major faults (after Son, 1998). (Lee et al, , 1999bShin and Nishimura, 1994;Ingle, 1992;Kim, 1999). In response to this tectonic event, several marine fan deltas developed along the western margin of the Pohang Basin (Hwang and Chough, 1990;Hwang et al, 1995;Sohn et al, 1997Sohn et al, , 2001.…”