H. Takayama
University of Tokyo
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Special Paper of the Geological Society of America | 2002
Ryuji Tada; Yoichiro Nakano; Manuel A. Iturralde-Vinent; Shinji Yamamoto; T. Kamata; Eiichi Tajika; K. Toyoda; Shoichi Kiyokawa; D. Garcia Delgado; Tatsuo Oji; Kazuhisa Goto; H. Takayama; Reinaldo Rojas-Consuegra; Takafumi Matsui
The Moncada Formation in western Cuba is an 2-m-thick weakly metamorphosed complex characterized by repetition of calcareous sandstone units that show overall upward fining and thinning. The Moncada Formation contains abundant shocked quartz, altered vesicular impact-melt fragments, and altered and deformed greenish grains of possible impact glass origin. In addition, a high iridium (0.8 ppb)
Special Paper of the Geological Society of America | 2002
Shoichi Kiyokawa; Ryuji Tada; Manuel A. Iturralde-Vinent; Eiichi Tajika; Shinji Yamamoto; Tatsuo Oji; Youichiro Nakano; Kazuhisa Goto; H. Takayama; Dora Elisa Garcia Delgado; Consuelo Díaz Otero; Reinaldo Rojas-Consuegra; Takafumi Matsui
The Cacarajicara Formation of western Cuba is a more than 700 m thick calcareous clastic sequence that contains shocked quartz throughout, and spherules. Three members are recognized. The lower member consists of limestone and chert boulders, and disconformably overlies Cretaceous deep-water turbidite. It is characterized by: (1) a grain-supported fabric with only a small amount of matrix, (2) 5–15 cm, wellsorted clasts and occasional boulders, (3) reversely graded, discoidal or rectangular boulders showing a preferred orientation, (4) abundant shallowand deep-water carbonate clasts in a well-mixed fabric, (5) direct contact between adjacent clasts, and (6) hydrostatic deformation within a black clay matrix. This evidence suggests that the lower member was deposited under conditions of high-density and high-speed laminar flow. The middle member consists of upward graded, massive to well-bedded, homogeneous calcarenite. Unusual fluid-escape structures in the thick calcarenite suggest that this member formed by high-density turbidity suspension. The upper member consists of fine calcarenite mudstone; there is no evidence of bioturbation. We infer that it was deposited from a dilute, low-density suspension. Kiyokawa, S., Tada, R., Iturralde-Vinent, M., Masui, T., Tajika, E., Gracia Delgado, D., Oji, T., Nakano, Y., Goto, H., Takayama, H., and Rojas-Consuegra, R., 2002, More than 700-m-thick Cretaceous-Tertiary boundary sequence of the Cacarajicara Formation, western Cuba; Ejecta induced high-energy flow deposit, in Koeberl, C., and MacLeod, K.G., eds., Catastrophic Events and Mass Extinctions: Impacts and Beyond: Boulder, Colorado, Geological Society of America Special Paper 356, p. 125–144. S. Kiyokawa et al. 126 On the basis of these criteria, the Cacarajicara Formation is interpreted to be a single hyperconcentrated flow that was formed by high-energy and high-speed concentrated flow. The south-southeast paleocurrent direction suggests that this highenergy flow originated on the Yucatan platform and was triggered by the Chicxulub impact. We propose that a gigantic flow deposit was induced by earthquake-generated collapse of the Yucatan platform margin owing to ballistic flow from the Chicxulub impact.
Sedimentary Geology | 2000
H. Takayama; Ryuji Tada; Takafumi Matsui; Manuel A. Iturralde-Vinent; Tatsuo Oji; Eiichi Tajika; S Kiyokawa; D Garcia; H Okada; Takashi Hasegawa; Kazuhiro Toyoda
AAPG Memoir | 2003
Ryuji Tada; Manuel A. Iturralde-Vinent; Takafumi Matsui; Eiichi Tajika; Tatsuo Oji; Kazuhisa Goto; Yoichiro Nakano; H. Takayama; Shinji Yamamoto; Shoichi Kiyokawa; Kazuhiro Toyoda; Dora García-Delgado; Consuelo Díaz-Otero; Reinaldo Rojas-Consuegra
Archive | 1999
H. Takayama; Ryuji Tada; Toshiyuki Matsui; Manuel A. Iturralde-Vinent; Tatsuo Oji; Eiichi Tajika; Shoichi Kiyokawa; D. Garciaanmd; H. Okada; Tsutomu Hasegawa; Kazuhiro Toyoda
Archive | 2001
Manuel A. Iturralde-Vinent; Dora Elisa Garcia Delgado; C. Diaz Otero; Reinaldo Rojas Consuegra; Ryuji Tada; H. Takayama; Shoichi Kiyokawa
Archive | 2001
Kenji Goto; Eiichi Tajika; Ryuji Tada; Manuel A. Iturralde-Vinent; Shoichi Kiyokawa; Yosuke Nakano; S. Yamamoto; David De La Fuente Garcia; Tatsuo Oji; Raul Rojas; H. Takayama; Toshiyuki Matsui
Archive | 2001
Ryuji Tada; H. Takayama; Toshiyuki Matsui; M. Iturralde Vinent; Eiichi Tajika; Tatsuo Oji; Shoichi Kiyokawa; David De La Fuente Garcia; H. Okada; Kazuhiro Toyoda; T. Hasagawa
Archive | 2001
Yosuke Nakano; Ryuji Tada; Tohru Kamata; Eiichi Tajika; Tatsuo Oji; Shoichi Kiyokawa; H. Takayama; Kenji Goto; S. Yamamoto; Kazuhiro Toyoda; David De La Fuente Garcia; Raul Rojas; M. Itturalde-Vinent; Toshiyuki Matsui
Archive | 1999
Shoichi Kiyokawa; Ryuji Tada; Toshiyuki Matsui; Eiichi Tajika; H. Takayama; Manuel A. Iturralde-Vinent