Tab. 1: Ar40/Ar39 results from Kuyul terrane, northeastern Russia

The Kamchatka Peninsula of northeastern Russia is located along the northwestern margin of the Bering Sea and consists of zones of complexly deformed accreted terranes. Along the northern portion of the peninsula, progressing from then orthwestem Bering Sea inland the Olyutorskiy, Ukelayat, and Koryak superterranes area acreted to the Okhotsk-Chukotsk volcanic-plutonic bell in northern-most Kamchatka. A sedimentary sequence of Albian to Maastrichtian age overlap terranes and units of the Koryak superterrane and constrains their accretion time with this region of the North America plate. Ophiolite complexes, widespread within the Koryak superterrane, are associated with serpentinite melanges and some of the ophiolite terranes include large portions of weakly serpentinized hyperbasites, layered gabbro, sheeted dikes, and pillow basalts outcropping as internally coherent blocks within a sheared melange matrix. Interpretation of magnetic anomalies allow the correlation of the Ukelayat with the West Kamchatka and Sredinny Range superterranes. The Olyutorskiy composite terrane may be correlated with the central and southern Kamchatka Peninsula Litke, Eastern Ranges and Vetlov composite terranes. The most "out-board" of the central and southern Kamchatka Peninsula terranes is the Kronotsky composite terrane, weil exposed along the Kamchatka, Kronotsky and Shipunsky Capes. Using regional geological constraints, paleomagnetism, and plate kinematic models for the Pacific basin a regional model can be proposed in which accretion of the Koryak composite terrane to the North America plate occurs during the Campanian-Maastrichtian, followed by the accretion of the Olyutorskiy composite terrane in the Middle Eocene, and the Late Oligocene-Early Miocene collision of the Kronotsky composite terrane. A revised age estimate of a key overlapping sedirnentary sequence of the Koryak superterrane, calibrated with new Ar40/Ar39 data, supports its Late Cretaceous accretion age.

俄罗斯东北部的堪察加半岛（Kamchatka Peninsula）地处白令海（Bering Sea）西北缘，由一系列复杂变形的增生地体（accreted terranes）带组成。沿半岛北部区域，从西北侧的白令海向内陆延展，奥柳托尔斯基（Olyutorskiy）、乌凯拉亚特（Ukelayat）与科里亚克（Koryak）超地体在堪察加最北部增生于鄂霍次克-楚科奇火山-深成岩带（Okhotsk-Chukotsk volcanic-plutonic belt）。一套形成于阿尔布期至马斯特里赫特期的沉积序列不整合覆盖于科里亚克超地体的各地体及地层之上，限定了其与北美板块该区域的增生时代。广泛分布于科里亚克超地体中的蛇绿岩杂岩（ophiolite complexes）与蛇纹岩混杂岩（serpentinite melanges）伴生；部分蛇绿岩地体包含大片弱蛇纹石化超基性岩、层状辉长岩、席状岩墙群以及枕状玄武岩，以内部连贯的岩块形式赋存于剪切混杂岩基质中。通过磁异常解译，可将乌凯拉亚特超地体与西堪察加（West Kamchatka）及斯雷德内伊岭（Sredinny Range）超地体进行对比。奥柳托尔斯基复合地体可与堪察加中南部的利特克（Litke）、东岭（Eastern Ranges）与韦特洛夫（Vetlov）复合地体对比。堪察加中南部地体中最远离大陆的洋侧地块为克罗诺茨基（Kronotsky）复合地体，其沿堪察加角、克罗诺茨基角与什普斯基角（Shipunsky Capes）出露完好。借助区域地质约束条件、古地磁学数据以及太平洋盆地板块运动学模型，可构建区域演化模型：科里亚克复合地体于坎潘期-马斯特里赫特期增生至北美板块，随后奥柳托尔斯基复合地体于中始新世完成增生，克罗诺茨基复合地体则在晚渐新世-早中新世发生碰撞。依托新获得的氩-40/氩-39（Ar⁴⁰/Ar³⁹）测年数据校准的科里亚克超地体关键不整合沉积序列的修正年龄估算结果，支持其晚白垩世的增生时代。