Upper Cretaceous sedimentary rocks are widely exposed around Trabzon, Giresun and Gümüşhane in the eastern Pontides. The sedimentary rocks are mainly composed of sandstones and marls, and the thicknesses of these rocks range from 170 to 400 m. This paper focused on Late Cretaceous sandstones of Trabzon, Giresun and Gümüşhane regions to identify the concentrations, sources, deposition environment and conditions of certain heavy metal(loid)s (Zn, Pb, Cu, Ni, As, Co, Mo and V). Enrichment factor (EF), geo-accumulation index (Igeo), Pollution index (Pi), Pollution load index (Pl_n), Pb isotope and multivariate statistical analysis were performed to elucidate the pollution levels and sources. In general, the evaluation indices exhibited that the sandstones were moderately polluted by As in the Trabzon area, and strongly polluted by Ni and As, moderately polluted by Co and V in the Giresun and Gümüşhane areas. The results of multivariate statistical analyses indicated that As and partly Pb might be originated from anthropogenic sources, whereas other metals were derived from geogenic origin. Lead isotopic analysis demonstrated two characterized signatures of the pollution sources in the sandstones, one related to geogenic origin and the other to coal, gasoline and pesticides. The sandstones were deposited in transition—marine environment under oxic—weak oxic conditions and paleoclimatic conditions ranged from arid to moist during Late Cretaceous period.

上白垩纪沉积岩广泛出露在庞蒂德斯东部的特拉布宗、吉雷松和古米沙内周围。沉积岩主要由砂岩和泥灰岩组成，这些岩石的厚度为170～400 m。本文针对特拉布宗、吉雷松和古姆沙内地区晚白垩世砂岩，确定了某些重金属（铅）（锌、铅、铜、镍、砷、钴、钼和钒）的浓度、来源、沉积环境和条件. 富集因子 (EF)、地累积指数 ( Igeo )、污染指数 (Pi)、污染负荷指数 (Pl _n)、Pb 同位素和多变量统计分析以阐明污染水平和来源。总体评价指标表明，特拉布宗地区砂岩受砷中度污染，吉雷松和古姆沙内地区受镍和砷重污染，钴和钒中度污染。多元统计分析结果表明，As 和部分 Pb 可能来源于人为来源，而其他金属来源于地质来源。铅同位素分析证明了砂岩中污染源的两种特征特征，一种与地质成因有关，另一种与煤、汽油和杀虫剂有关。