Hydrothermal petroleums and heavy tars have been analyzed for polycyclic aromatic hydrocarbons (PAH) with molecular weights greater than that of coronene (300 da). Samples from the hydrothermal systems in the Guaymas Basin (Gulf of California) and in the Escanaba Trough and Middle Valley (Northeastern Pacific) were analyzed by gas chromatography-mass spectrometry and high pressure liquid chromatography with diode-array absorbance detection. Mass spectra and fluorescence spectra were used to characterize the compounds. Several large PAHs with six and more rings were identified among the heavy PAH. Production routes via one-ring build-up and Scholl-condensation are proposed to explain the observed structures. The variations in PAH concentrations and distributions between samples from different locales are a consequence of the hydrothermal conditions of generation, migration, and post-depositional alteration.

中文翻译：

---

加利福尼亚湾和东北太平洋热液石油中的高分子量多环芳烃

已对热液石油和重焦油中的多环芳烃 (PAH) 进行了分析，该多环芳烃 (PAH) 的分子量大于晕苯 (300 da)。来自瓜伊马斯盆地（加利福尼亚湾）和埃斯卡纳巴海槽和中谷（东北太平洋）的热液系统样品通过气相色谱-质谱和高压液相色谱与二极管阵列吸光度检测进行分析。质谱和荧光光谱用于表征化合物。在重多环芳烃中发现了几个具有六个或更多环的大多环芳烃。提出了通过单环堆积和 Scholl 冷凝的生产路线来解释观察到的结构。